Hope I'm not too late with this, but I just had to toss my two pence in here.
A lot depends on the kind of player you are up against. Is it even remotely a friendly game? If so, read the part labled one. However, if you think the ogre player is going for as brutal a smackdown as possible, go to two.
*PART ONE*
At 600 points, your opponent will either need to bring 60 gnoblars, in which case you won't really have to worry, or at least 4 bulls or ironguts in order to fill out the core bit.
Odds are, that no matter what kind of character he picks, it will be plonked in that unit for protection and extra hittyness. Equally probable, this unit will be made a bit bigger to be actually effective, which means it will take up a lot of points (for a 600 point game) very quickly.
This of course means you will be up against your everyday close combat death star with added herosauce. and with at least half the enemy army being a single low leadership unit, salmander salmander salmander salmander. Not too many though, since it would be what could be considered an extreme dick move in a friendly game. Besides, one or two should be more than enough to make even a firebelly run for cover.
*PART TWO*
Of course, there is always a chance that you'll be facing something like an ironblaster, which can be best described as "pretty <expletive of your choice> nasty". As mentioned before, the thing will blast iron, almost invariably at skinks, since most of not all ogre players have an (irrational?) fear of the things.
This, together with the possibility of him NOT taking a bruiser for whatever reason pretty much shapes your army.
Between an ironblaster, scraplauncher, leadbelchers and mages, there's a lot of things that might be there to beat your game winning block of saurus to death before it can serve a bowl of fresh break test to his core-with-probably-a-general. You might think this means you should get a lot of war machine hunting chameleons to shut them down, and a skink priest for some antimagic. I would, however, argue against this.
No matter what you throw at his shooty bits, almost all of them strangle you to death with your own intestines in close combat if you annoy them enough, and will otherwise just ironblast or fireball you away with contemptous ease. It might save you turn or two of shooting, or shut down the shooty completely if you are really lucky, but all in all this is a huge waste of resources, since your expensive units will then do nothing useful but cheer your saurus on for the rest of the battle.
A better solution to the problem is one that a typical ogre would appreciate for it's straightforward brutality: more saurus: more beatdown.
you can easily field a full size unit of saurus (left to your imagination) at 600, and have points left for a couple of skinks, a hero, and even some chameleons just for the heck of it. Using some skinks as a shield against things with ballistic skills, or otherwise as a much much cheaper source of neener-neener than chameleons by harassing everything but the main course, march your saurus across the board as quick as you can. Sure, a bundle of them might die to stray forks, chunks of magma, or bits of metal, but a decent bundle of them should make it all the way across to complete the great plan of the old ones known in the prophecies as "Slappin' som' ogahs, boo ya!" And if for some bizarre reason he decides to focus fire on something that is not a saurus, just make sure it's not too close to your saurus, because everyone knows that panic tests on cold blooded eight might be statistically easy to make, but in practice a bottomless pit of failure when it actually matters, and you should be good to go.
As for your general, either a skink or a saurus would suffice. But remember that although that skink might get a game changing buff off, or stop that horrible maw from being cast on your saurus, it'll probably not happen, and his squishyness plus general bonus mean he'll be 200+ free victory points if some kitties tag along with the ogres.
For a scar-veteran, you need to realise one thing: He is part of your saurus unit. General kill-bonus? yes. A great target for a great weapon? Yes. A pretty big investment on 600, so you instinctively want to protect him? Yes. But he is not vital. Let me repeat that again: He is not vital.
Of course that doesn't mean he should be used for target practice, but it does open up a few important points:
Cheap is good. It means that you'll be able to fit a few more saurus or skinks in there, and you'll really feel the extra models more than the extra strength at that level.
Although fencers blades or shiny armour might keep him alive a turn longer when everyone wants to "kill dat lizzurd ded", toughness 5 and a pretty good armour save without magic trinkets will keep him going most of the time, and if you're rolling bad, odds are those magic trinkets wouldn't have changed it. Besides, a bruiser would be you but tougher, so you'll not be winning that headbutting contest anytime soon.
A great weapon here and a potion of foolhardiness there, on the other hand, doesn't cost you a lot, but will help you rack up a few more vital combat resolution points before you are turned into a greasy paste. And that's if he decides to target your scar-vet at all, in which case he'll score less wounds than he would have on your saurus, so you should be grateful.
You could of course opt for the crown of command for that extra security if you do happen to lose a round of combat, but honestly, you should never lose a round of combat. Not to say that it'll never happen, but if it does, it means the big mean ogres will have punched a big enough hole in your fighty unit that your biggest advantage will be removed. After that it'll probably only go worse, so best to avoid it altogether.
*LONG STORY SHORT*
Saurus are your friends, even if they don't both start with an F.
A skink is fine too.
Units are like steaks: bigger is better
Also: Saurus.
Chameleons are not worth double their cheaper cousins. Not right now at least.
It doesn't really matter all that much what kind of general you take. Well, it does, but not in the win percentage changing way, really.
You can rely on the brute force of your cheap saurus to completely overpower anything he will throw at you. Really.
and some closing thoughts:
Either take a bunch of saurus (23 to 30 does the trick) or none at all. A small unit will give you the same problem your opponent has: small units don't really make the impression needed.
If you have your focal unit, the rest is just for fun, really. Take a dozen jungle swarms for all I care, as long as it annoys your opponent, keeps him off balance and you have fun zipping it around the table it does all that it needs to do and more.
