In terms of performance per dollar/pound/euro, you are best of buying an AMD Athlon64 CPU. Dependant on budget, you should look at something around the specification of AMD Athlon64 (939) 4000+ or a AMD Athlon62 X2 (939) 4200+.
In terms of motherboard, I would really have to recommend you look about for a board that suites your budget, but something with the Nvidia Nforce4 chipset is a sound bet. Make sure you buy a board with AGP/PCI-XPress and that you have a modern enough power supply (PSU) to handle the load of your new components. Also some legacy PSU's might not have the right connectors for your motherboard or choice of GFX card, so be careful.
If in doubt ask here or PM me.
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