The Ati 9800 Pro is good if you go for the Sapphire Lite edition you can get it for about the £120-130 mark, I've got a GeForce FX5900XT good card plays everything including Far Cry which needs a very good card and that also was about the same price. If you can't afford this amount then there are lots of others just under the £100 mark such as FX5700 and the like but they may struggle playing the very, very new games at a high resolution. It really depends on 2 things, how much you can spend and what sort of games you'll want to play. Whatever you buy my advice is buy a branded card by that I mean a well known make, Sapphire are excellent as are MSI and Gigabyte, anything by a well known company is ok.
I want to be able to play new and forthcoming first person shooters at 1024 by 768 resolution. I'm not sure whether my PC's power supply could handle a high-end card. As for my budget, assume there's no limit.
I would go for the FX5900XT for just over a £100. Try MicroDirect. Mine palys everything you throw at it including FAr Cry, Pain Killer, Deus Ex etc. The suggestion to upgrade your psu is a good one as the 5900Xt has to have power supplied to it directly by a molex connection. 250w is very low nowadays. You can get a 600psu from Ebuyer for £22. It is excellents as I have one.
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