The ATi driver's in general have been more buggy then Nvidia's for none sim games (it's all other the net on various forums) but in general allot of the time it will be more annoying bugs then things that will stop you playing games successfully.
The market right now in the video card world is very good, you have the 460 a bit cheaper then the 6850, which if you clock the 460 and flash it's bios to increase it's vaults it can be close to the same speed as a stock gtx480... It's the same situation with the 470 vs 6870. The 6*** cards use less power, and are a bit less noisey, while Nvidia's fermi offerings offer much better scaling when overclocked, so if you was going to clock you would get more performance out of them.
You can't go wrong with either though and really it's a personal preference which you go for.
Right now though, Nvidia's cards are cheaper, and the GTX 470 is the best bang for buck now for around £180 with after market cooler, so noise and temps are low.
http://www.ebuyer.com/product/222349
Unfortunately. I'm stuck with a Dell with ameasly 375W PSU, coudl just about squeeze in a GTS450 as it needs according to the specs 400W. Then the Dell Psu's are conservatively rated. Anyon have any better tips?
I would not worry about the wattage, rather the amps on the V12 rail(s) The Dell PSU's are good and reliable, and you should be able to have a 460 or 6850 and run them without any issue's.
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