RAM for OC

[Orioz]

Which RAM should I buy for OC:

PATRIOT 2x512 XBLK 2-2-2 PC3200+ DUAL CHANNEL CL 2-2-2-5 ?

OCZ DUAL CHANNEL PC3200 2x512MB PLATINUM 2-2-2 ?

OCZ DUAL CHANNEL PC3500 2x512MB GAMER EXTREME GX up to 3.1V. ?

I saw one kit (PATRIOT XBLK) @ 280MHz 2.7V 2.5-3-3-5 and has a low price...hehe