I heard that you really dont get the full potential of the Prescott until you have the 3.6 chip, so go with Northwood for now until Prescott hits the 3.6 mark.
Intel Pentium 4 3.2 ghz 800 FSB
Abit IC7-G 875p
Sapphire Radeon 9800 Pro 128MB 256 Bit
2x512MB Ultra PC3200 DDR400
Maxtor 40GB 7,200 RPM HDD
Lian-Li PC65 Case