Well depending on what you need it for, I would suggest,
Corsair 2GB DDR XMS3200C2PT TwinX (2x1GB) CAS2 -
£151.52 (inc.VAT)
or
G.Skill 2GB DDR ZX PC3200 (2x1GB) CAS2 Dual Channel Kit -
£152.69 (inc.VAT)
Personally I'd go with the ZX, as it has great timings for a 2Gb kit and can be overclocked as well.

Great price also!