WD is Rockin, #1 HDD Brand byfar.
RAM is so cheap ATM, you might aswell just pick some up.
Also, I have the Lachesis, Newer Cousin of the Death adder, Thing ROCKS!
Nice build, I built mine a LITTLE before SandyBridge came out, so I have the i7 950, and 2 460 Hawkz.
DEFINETLY get the AX850, I have the same PSU, thing is a Fucking CHAMP!