Hi - just so you know this forum tends to slow down a bit on the weekends so be patient for a reply 
As for choosing a species these animals do not like to be handled though some will tolerate. I am told that veileds are more aggressive, but since I only have one (a 15 month old veiled) I can't compare her to another. She can be bit-cy but she is my little sweetie. Panthers tend to be more colorful than veiled so a lot of people like them for that reason.
AdCham (see below) has profile on MANY species and Cham News has done some srticles on certain species.
Thsee are a few sites that are recommended:
Chameleon News
This is a top source of current information compiled and written by “tops in their field.”
www.chameleonnews.com/
AdCham
www.adcham.com/
Chameleon Paradise – a site by one of our forum posters. He has FAQ, do’s and don’ts, cage building
http://www.chameleonparadise.com/
Chameleon Journals – www.chameleonjournals.com/
Reptayls – another site by a fellow KS poster
groups.msn.com/REPTAYLSChameleons
Obviously the most important thing for any herp is to have a proper setup BEFORE you get your animal, but I am guessing since you have herps already you probably know that.
After you check out the sites feel free to ask questions here (just be patient on the weekends
)
lele
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0.1 veiled - Luna
0.2 house geckos - Gaia & Tia (both MIA 
0.2 felines - Kyndra and Líta
1.0 African Clawed Frog (for summer)
0.5 Mad. Hissers (for summer - all girls, no little ones, whew!)