Memory for GA-8I875

I am about to buy a GA-8I875, as apparently it is the ultimate solution for
the latest Intel Pentium 4 processor with 800MHZ FSB and Hyper-Threading
Technology. Sounds wicked.

I am getting a Intel Pentium 4E 3.0 1MB S478 800FSB and I need to put 1GB of
RAM with it, and I am unsure of what will be my best memory bet.

I am thinking of going for a pair of Kingston ValueRAM 512MB 184Pin DIMM
PC3200 DDR RAM Non-Parity CL3 (at £110 for the pair).

Just how much performance improvemnt would I see from buying Corsair
TWINX1024-3200XLPRO or similar to give me a nicely matched pair of
overclockable DIMMS?

TIA

MarkE