You can get an epox 9NDA3J board with venice core athlon 64 3000 (retail boxed) for about $250. The epox board will work with your agp card, and provide some overclocking options in the bios. Don't know if your pc2700 memory will work with this board, but memory prices are down right now, and you can get a gig of name brand pc3200 for less than $100 at many venders.
P4 was never great, but the Northwood core version was fair. Then Intel went with a new core that offered worse performance with greater heat, and nobody with an open mind wants that.
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