Well, I prefer Geil. I bought a 512mb stick of PC3200 (OEM) w/ 6-3-3-2 timings and I run it at 3-3-3-2. Corsair is really overrated....
Also, I was just messing around seeing how fast I could get the RAM to do and I got it up to 466mhz DDR when it was stable. I always keep my RAM at the same speed as the bus for better performance.
a buddy of mine had some good luck with it, i think that he bought a stick of pc3200 256MB, and it makes it to 200MHz FSB with ease... but i don't think he's going to have to push the ram.
id say its a good brand to pick. I believe that OCZ released some PC3700 GeIL Gold Edition [blah blah blah] ... um saw it at vr-zone.com
I often use GiEL, even have two 256mb PC-3200 sticks in my personal desktop right now. Running at 434 MHz at stock voltage and tweaked timings. Great memory IMO, and I am even planning on reviewing some GiEL offerings in the near future for TechIMO.