i have the c4 xms and it is really good ram. you have to work to get the most out of it, and it is time consuming (but fun for some of us). i can run it 4-4-3-8(maybe lower) with 2.2v., from 4-4-4-12 rating. it took a lot of tweaking.
if you go with it, great...i cant really complain, except about the price i paid...like 250-60 bucks...
if you choose to go with the gskill, consider the HK model. they're like 180.00
Newegg.com - G.SKILL 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Retail
and they come with stock timings of 4-4-3-5. and thats just sick, man. sick. i gar-awn-tee i will be buyin these for my next build...and if they dont do me right, i'll replace them with my old xms.
"nagasama no longer drinks tecate, or streaks out of the night for anything, and he has a fine wife so he has no use for your girlfriend...she is safe..."