kingston, corsair or OCZ

i'm upgrading my computer's ram. i currently have 2X256 of corsair's low latency 3200 ram. I need more ram for games coming up and i was wondering what i should get...

kingston hyperx, corsair XMS or OCZ... 2 sticks of 512 is kinda expensive, and although i want to save money, i am running an overclocked system. also is 3200 good enough for like farcry on a 2500 mobility OC system or should i go for 3500 3700?

thanks

ive got ocz 3200 platnum 2x512 sticks and im well impressed with it...

imo
KINGSTON HYPERX 512MB DUAL CHANNEL KIT PC3200 2X256MB DDR 400MHZ 184PIN
$247.35 CANADA PRICE

http://www.ncix.com/products/index.php?sku=10797&vpn=KHX3200AK2/512

overclockable?

which of the following are the are the best for overclocking.