I think I've worked out a nice machine

Mm, yes! Sexy setup. I agree with Relic though, I can't begin to tell you how many people have requested a p180 case. But, in my experience it's always best to get a decently high watt power supply just in case you decide to upgrade/add a part later. Therefore you will not have to worry about it until later. On a more personal note, I've steered away from nVidia as of lately. I have frequent problems with them or the cards just don't measure up to what you're expecting. I've only dealt with a 7 series once and that was when I was installing it for a client. 5xxx was a terrible series and is the main reason why I ran from nVidia.

Jam it back in, in the dark.