OK, got the 500w Coolermaster in. It only goes one way and the fan is actually on the bottom not the top. I just assumed it was on top because of the picture on the box. So everything is ok, now I just need to decide on a GPU. So a HD5770 is better than a GTS450? I see that they're roughly the same price. Why do you prefer it HostileDonut?
So, they have a few watt different TDP, (same heat output and power consumption) Nvidia has CUDA, which is nice, but not worth it, the hd5770 is a better card in performance. One reason I would buy it is because it is AMD, but even an Nvidia lover should get it over a GTS 450 because it is a better GPU.