Are you planning on overclocking? If you are, get some G.skill value ram. They can get to 250 at lower timings. I don't think timings matter as much as bus speeds in AMD XP systems. Also, I don't think your board supports dual channel mode, so don't worry about dual channel kits.(ps, if your not planning on ocing, that xms ram is uneeded)
6600GT PCI-E for sale/Trade. Check the FS/FT forums on tech-forums for details.