Corsair XMS vs Kingston HyperX for my new NF7-S V2

[mattitude]

My new rig I'm in the process of putin together after my outta control day @ newegg.com

Abit NF7-S V2
XP Barton 2500+ (0345)
Thermlright SLK 900a
Antec slk3700amb case
LITEON BLACK CDRW/DVD 48X24X48X16
(reuse for now) Visiontek GeForce 4200
Maxtor 60gig 7200 ata133

This is gonna be GRRRREAT!
My current problem is pullin the trigger on some good ram. OH, and a good quiet fan for the 900a. I've gone round and round and still can't decide on which set of twin 512's like

Corsair TWINX1024-3200LL
Corsair TWINX1024-3200LLPT
Corsair TWINX1024-3200C2PT
Corsair TWINX1024-3200LLPRO
Kingston HyperX KHX3200K2/1G
Kingston HyperX KHX3200AK2/1G

How bout some feedback comparisons between Corsair XMS and Kingston HyperX for hardcore gamin and overclocking in a NF7-S?