Going with MSY?
I’m not sure on quadcore stats or your card, but 600W power supply should be plenty. As for the card I got the 8600 GT. If I had the choice again, I’d go a little beefier and I suggest you do, but looks like you are planning to anyway. I can run Crysis fairly well and sculpt polys in the millions so I’m happy for now. I haven’t used ATI for comparison, but I’ve never had Blender kick up a fuss with Nvidia - in Windows or various Linux distros.
One thing to keep in mind - there is no set ‘installer’ for Blender 64bit on windows from blender.org, just the files to unzip. I don’t have vista, but you might want to check all that first. With 500mb you could easily dual-boot with a 64 bit version of linux as well, make the most of a variety of test builds.
8gb of ram sounds great, but you will need to push things fairly high to need it. May as well if you can though. There is always the chance that a future job will need a huge fluid sim or whatever.
The rest all looks pretty straight forward. With the monitor, I’d be interested if you have ‘shopped around’ comparing LCD’s. I use a 17inch 4/3 flatscreen and CRT at the moment because it’s what I have around, but to be honest I think the CRT colour/brightness depth still wins, although the black isn’t quite as ‘black’ as the LCD. My brother has a 22inch BenQ, not sure if I like it that much.
Now inspired to find out how many Adelaide / SA Blender users we have here on BA.org, I’ve run into a few… online though.