I'm not sure if you are still looking at RAM, but if so....
I have used both the Corsair 2x1gb 6400 and Corsair 2x1gb 6400c4 RAM. I never could confirm what chips they used, but I sort of figured it wasn't D9s. That said...
Both of these kits boot and run 100% stable at 1.8v. I built a new rig back in August with an E6300 and Gigabyte DS3, the infamous board that couldn't run most high end RAM due to 1.8v boot issues as ya probably well know. ;) I have had zero problems with the build, F1 BIOS or F10.
Both kits will do 501mhz, 1,007mhz effective with 2.1v @ 5-5-5-15 timings... As far as stability goes, I have a link to the 24 hour+ 501FSB run in my sig.

The kits will run overclocked with less than 2.1v voltage around the FSB speeds you have given, infact the vanilla kit claims 1.9v stock, but runs stable at 1.8v.
Back in August the vanilla Corsair 2x1gb 6400 was just about $180 when I ordered mine, it is now
$169 shipped after MIR.