Most would say Corsair XMS but I use Corsair value select and it works like a charm. what i do is i buy some copper heat spreaders and then just lower my cas latency. works the same as XMS.
Yeah Corsair XMS or Kingston HyperX if you want the high performance series, but I too have just the Value RAM from kingston and it works nicely. I've also applied copper heat spreaders like circa and I've had no problems
im using 3 awesome Kingmax memory modules, 2x128Mg and 1x256Mg, total of unbelievable 512 Mg running at magnificent 133 Mhz with enviable cas latency 3_2_2