Everything seems to go with black in my opinion.
Where the PSU is located depends on the case really. I like the cases where they are located on the bottom. It looks nicer, and seems easier with cable management.
I could probably make my case a lot nicer if I didn't want the front ports (USB, 1394, e-sata, etc). Oh, and the Xigmatek retention bracket I bought actually worked with my HSF. It's nice to actually use this thing (bought it over 2 years ago) without push pins.
Haha, I just noticed my second 8800GT looks like a wimp compared to my dual slot version.