Thanks. I guess the next step is to actually measure the GPU space and ask again unless anyone else has any suggestions. My default was the 5770 anyway but I was looking to beef up a bit more. Regardless, anything will beat the stock 310G that this box came with.
That's a 10.5 inch card in that photo, none of the cards you are considering are as large.
Any of them would fit, it's up to you.