Ooh, problems. For one, the PSU that comes with that case is a cheap tier-5 sparker that only puts out 17A on its +12V rail. It will die almost instantly trying to power that system. If you're lucky, it will just shut itself off. More likely, you'll get to see and hear some pyrotechnics and it will take something else with it. Choose a PSU from tier-3 or better from the list at http://www.xtremesystems.org/forums/showthread.php?t=108088.
Second, Diamond earned a place on my personal blacklist recently. The HD3870 I got from them is still on a shelf; I'm hoping newer ATI drivers will allow it to work properly. Diamond's site has problems (I couldn't get support on it without signing up, but signing up was broken). I finally managed to get a free chat session with an absolutely useless drone. I could not get card-specific help on the ATI site either because Diamond wasn't even listed as an OEM partner. And finally, I just shut down another browser session on Diamond's site because of that pop-up advertising that tells you you're infected and wants to install poo-ware on your system. NO THANKS, DIAMOND.