Sao could you post some picks of your convert cold ones to salamanders? I have been thinking of doing the same thing but I can't find much inspiration on the web.
I'm personally aiming for 45 or so Saurus (+ some unit fillers). 50 or so Skinks with 20 converted Chameleons and 30 jav or blow dart. 2-4 Salamanders (remember handlers so + 3 skinks per sal), 1 Slann, 2 Priests, 2 Scar Vets on Cold Ones, 20 TG. 5 CoC (for variety sake).
Then Later I will consider getting 3-5 Terradon, 2 Stegs with magnetic mods so I can fit any extras eg EoG or Howdah. And a Old Blood on something.
All that added up should be 3000+ pts I think. Easily 2000+ with a lot of variety.
So if you open to sculpting: I'd buy 2 Battalions + 1 Box of Skinks + 1 Priest. That will get you playing very solid 1000-1500 pts. Add Slann and (finally use) the TG for 2000pts, add all the other stuff for 2500+ points.
Remember you can buy specific bits on eBay fairly often as well. Eg a Howdah or EoG bits to add to you steg, or some TG armor and weps to convert CoC into Scar Vets.
A battalion will give you (very roughly) 500-600 pts if you use all the models how they are meant to be.
LoL ~ forgot the battalion box comes with 10 TG. Use them to make Scar-vets and make a force of 18 or so TG for your slann when you buy one.