If you can spare the extra cash these are worth it:
Newegg.com - G.SKILL 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Retail
I have 4GB and they come highly recommended by me and alot of others in these forums. They are extremely good at overclocking, especially considering the price.