You may have a tough time stretching a new video card another three years. In three years everyone will be using PCI-Express and the old AGP cards simply will not be able to keep up.
I don't know what kind of budget you have, but my suggestion would be to gut it. Get yourself a rock solid motherboard (processor make of your choice, although I generally prefer AMD for towers and Intel for laptops) and couple it with the cheapest cpu and RAMyou can find for it and a budget model video card (sub-$100). Even the current budget cards ought to outpace your GF3 in terms of performance and by building around the motherboard instead of buying the motherboard to suit your other components you'll allow yourself the greatest amount of flexibility.
I've always done well by ASUS boards. My local shop will sell me an A8N-E, an Athlon 64 3000 and an ATI X300 for under $400 CDN. The board gives you all the latest standards (socket 939, PCI-E x16, etc) and the bare bones components on those standards clock in pretty cheap, giving you a nice performance boost and allowing you to upgrade as needed (and as cash on hand allows). You should be able to get similar components in the brands of your choice at around the same price, expecting $400 CDN to equate to about $300 US.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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