I thought the K8N motherboard had an AGP slot, not PCI-e. If so, forget about the 8800 series because that is PCI-e only. The best performance for AGP is probably the ATI X1900XTX but that is quite expensive and also very loud. The Geforce 7950 is probably your best bet. Either will outperform the 8600 series, though I'm not sure that's available in AGP either.
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