either this one:

Patriot Viper 6GB (3x2GB) DDR3 PC3-12800C8 (1600MHz) Low Latency Tri-Channel (PVT36G1600LLK) 8-8-8-24 £141

or this one:

G.Skill Ripjaw 6GB PC3-16000 (2000MHz) 9-9-9-27 £160

im planning to fit it into a Gigabyte x58 board with a i7 920 D0 and water cooling. so yes i plan to overclock.