I upgraded my Dell late last year with an Nvidea 8800 GT card and it has worked very well with no problems.
I must admit being a bit of a tinkerer I had fun modding the PC to take it by installing a new power supply, modifying the generic harness and plug setup to fit my internal layout, cutting soldering etc
I also have an 8600 in my laptop which runs ok, EU on full settings works but is a little jittery.
Never heard too much bad stuff about ATI cards.
It's horses for courses really I guess.
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