I'm most worried about the Case and if it's compatible with the stuff I've got. But I'm sure I'm missing something. I've already picked out a monitor, a keyboard, and a mouse. I'm not sure if I'll need to have a DVD drive yet, but if that's super necessary than I'll grab one. I'm not super well off, and I've been saving up in college for something that'll be good. In other words, I'm sort of price inflexible, but we have some wiggle room.
Thank you all for your help, the links are provided for clarity. I appreciate all the tips.
You will certainly need a DVD drive if you intend on installing any software on your PC. Also games look for their install DVD when you go to play them and so you will need that drive to have the disk ready to go. As long as your Case is ATX compatible then it will be good to go. Having looked at the one on your link it looks like its designed for the job.
But the motherboard, graphics card, and PSU all work together right? Will the PSU be able to power this computer? Also, could you clarify what "400 WATT PS2" means for the case? It's on as a specification.
You could save $20 by dropping the Phenom II x4 965 to the 955. The only difference between these two is a one-point change in multiplier. Since both are unlocked processors, you would simply go into BIOS and raise the 955's multiplier by one and you'd have a 965.
HDD: The 640 GB Caviar Black is not as fast as the Samsung Spinpoint F3 500 GB or 1 TB drives. The Samsungs use 500 GB platters whereas the Caviar Black 640 uses 320 GB platters. More platter density means more speed.
Case: Yes, it will be compatible, but I don't think that's the best case for the price. It's $70 + $17 shipping. A much better case in terms of cooling and features would be this one from Cooler Master:
EDIT: I just did a search through the forums and it seems to me that you can pair up an nvidia card with an AMD motherboard, but that you can't run two nvidia cards on an AMD motherboard. Is this the general idea?