I'm not sure if you bought anything or not, but I'd suggest this power supply:

http://www.newegg.com/Product/Produc...82E16817151028

It's very quite and 85%+ efficienct.

If you don't plan to overclock, then there's no need for anything other that PC5400(667mhz). Unfortunately, it's hard to get good timings unless you step up to PC6400(800mhz) Look for 4-4-4-12 timings, that'll give a slight edge on access times(micro seconds, but running 5 clients it'll help). Something like this:

http://www.newegg.com/Product/Produc...82E16820145194

For video, I haven't used the new ATI 48xx's yet, but the reviews look good. A single 4870 should be able to handle 5 boxing, but I haven't done it so I can't recommend it. What I have used(currently using) is a single 8800gts 640mb. 2 monitors w/ clients set at 30fps max and main at 60fps.

But... the 8800 series has been dropped, so what's out there is all there is. If your going to get one, get it now before they're all gone.