If you're interested in the super high end and want 2x2GB of memory - keep an eye out of the G.Skill F3-14400CL8D-4GBGT1 "GT1s" because they should be among the best there is. The price should be very competitive, the cooling is actually no noisier than Corsair's Dominator with fans overhead but the RamOrbs will certainly cause at least some of you reading to turn your noses up - it'll be a field splitter.
Check it out at Bit Tech.