I have 2x1GB Crucial Ballistix sticks. They're pretty pricey at $380 for the set direct from crucial.com, but they're the best you can get as far as I know.
That said, I haven't been able to run them at 1T even at 200fsb, and they're supposed to work at 250fsb. This is on an A8N-SLI prem with...