Ohh you are gonna love having a crestie or two.

I have my young adult pair living in that same viv, they do just fine and my set up is much like yours.

You can house females together, but I would not reccommend that you house two males together. So if you get 2, you are gonna have to watch them to be able to tell what you have sex wise as they mature. That way, you can control whether or not they breed too young (if male/female pair) or to separate them if male/male.

I wish I could remember right now where I saw them, but I saw these really cool water/food dish things, that have a small platform.. that you can hang off the side, they are made for use with cresties I think.... soon as I find it again, I will let you know, I was thinkng about switching over to those. I saw something like those at my local petsmart, and they attach with a suction cup, but man are they just way heavy and I was afraid it would be too heavy for the suction cup provided. So I never bought them.

Ohhh! I found it! Scroll down a bit!
http://www.pangeareptile.com/products.htm