Hmm to be honest I think it's better getting a new PC? I don't know what games you're planning on playing I think you'll need more RAM (min 256) and in answer to your video card PCI ones are cheap now a days. Do you live in the UK? I'd recommend www.overclockers.co.uk to buy from as I've never had a problem from them? You might wanna check out on this.....
I had a simier disscussion with someone called Ozos whos help my well.
I think the ATi 9225 and Nvidia 5200 are both good cards and come in PCI flavors.
I have a Hewlett Packard desktop pc a465W and can't run the new games on my VIA/S3G video card. I want to upgrade but not sure which one to use. I have a 2 gig harddrive with hardly nothing on the memory. I have over 128 megs of ram. and still can't play newer games. One game requires an AGP card with hardware transform and lighting and I don't have a clue what that means. Can somebody steer me in the right direction. Don't have alot of money to spend but would like to upgrade to at least play the ones I have.