Ive got a canon powershot s50 5.0 megapixel. I love that thing, I can take a pic of a cham from across the room and crop it down and still be able to see every single scale on the chams body in the picture. most of the pictures on my website were taken from a long distance away and then cropped down and they are all still incredibly clear. Matt has a slightly lower megapixel camera, 3 something I believe, but that takes really good pics as well. He brought it down last time he came over and we were comparing them. If you want truly awesome pics go for the 5.0 but if price is the biggest factor then go for the lower megapixel, not quite as good but still plenty good enough for reptile pics. Hope this helps 

www.chameleoncollection.com