The Crucial Ballistix Smart Tracer 6GB (3x2GB) PC3-12800 kit is very stable and offers solid performance. The extra features that Crucial have added to their standard Ballistix sticks not only give the consumer more bang for the buck, but make this a very attractive kit, considering that they're priced right in line with other 1600MHz triple channel kits.
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips