The case you chos is kinda iffy, I'm not sure it will have enough room for your components. The fan in the middle of the case is an intruiging idea, but it may get in the way of your GPU's, and its only 7.9" wide, so a cooler might have trouble fitting (which you should get so you can OC)
If you are on a budget, then take a look at this case: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
If you can afford a bit more, then look here: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
This promo code gets you free shipping if you order by tomorrow, which saves like $20: EMCLRLN22
I checked the case and didnt have a problem with it once I saw that one NewEgg customer reviewer said he managed to get his GTX 280 in the case. For a 2005 vintage case it's still pretty decent.
The fan on the side door is a likely problem for a tall CPU cooler.
Just thought I would let you know that if you are planning on getting a 24" monitor in the future and want to max your games out you might want to pop for a 4870 1 GB, or even a 4890 to truly future proof your system. I currently have a 4850 and it runs most games maxed, Crysis is definitely an exception.
I don't know too much about AMD motherboards, but I don't know if it is worth it to pop for DDR3. Maybe downgrading the motherboard and snagging the DDR2 will allow you to pop for a better graphics card.