Arguably the best AGP graphics card atm is a HD4670 (e.g click here), but they don't come cheap at £70-80 click here.
We may have to determine if your motherboard will be compatible. Will require a 400W or greater PSU (going by info at HIS click here), & is powered by a single 4pin molex power connector. It'll do well if paired with a fairly good CPU - an AMD Athlon 2000+ is likely to limit its full potential. G
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