Which Card?

As I am about to build a PC, currently I am looking at buying a gfx card. All 3 of the following are in my price range, but I can't really go any higher (8800 GTS 640/8800 GTX) right now. All prices are NZD.

Unfortunately, the 8800 GTS 320 isn't on the charts here so I can't compare them.

Geforce 8800 GTS, 320MB, PCI Express x16, $569.89 or
Radeon X1950 XT, 256MB, PCI-Express x16, $537.75, or
Radeon X1950 PRO 512MB, PCI-Express x16, $421.40.

FOR THE PRICE which is best. You can suggest other stuff if you want. Also, how grunty a PSU am I going to need if I get the 8800?

(Btw, X1950 XTX 512MB, is $665.00 in New Zealand at the very cheapest, and I can't go over $600)

The 8800 is best choice.

Ditto on the 8800GTS 320.

You'll need a PSU that supplies at least 26A across the 12V rails. You do not add up the total amperage on the rails to get this figure. See the PSU-101 sticky on calculating the amperage across the 12V rails.

The Mushkin HP-550 would be a good candidate. Stay far clear of the Antec SmartPower series.

Yeah, what they said. 8)