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Should have the money for the thing in the next 3-4 months. Might even be able to knock off another ~$285 if I can get Win 7 from Dreamspark.

Two more questions, though. Do I absolutely NEED a soundcard, or is there something built in that I can use for sound? And is a case fan a neccessary investment for such a tiny case?

Most motherboards come with built-in sound cards. The smaller the case, the hotter, so yes, you want a case fan for a tiny case. You can find cases that come with fans, though. My case had two built-in.

Edit: I just looked at your build - it's very similar to mine. I happen to have the same case, CPU, SSD, and motherboard. The motherboard is on the higher end and has a nice built-in sound chip; there's no reason to buy one. The BitFenix Prodigy comes with two case fans. If you're asking about the CPU cooler, you definitely need one if you plan on doing any overclocking, (and it looks like you are, looking at your CPU). If not, it's nice to reduce temps and noise, but not necessary.

Edit2: I'm using a 600W power supply and I haven't had any issues. You could save 10-20 bucks there.

Don't buy Windows 7 Ultimate. That's a serious waste of money. Ask around for an ISO. I could get you a copy of Professional if you need.