Those ballistix you just purchased (800 PC2-6400s) are the same as the PC2-8000s (1000) just with different SPDs. You will easily get 1000mhz speed with 5-5-5-12 timings with I believe 2.1-2.2 volts. I am also pretty sure you will be able to tighten those timings down just a bit.
I personally am using the same ballistix in a different manner. I am running (actually was, am down for the moment) at 600mhz with 3-2-2-4 timings and 1.93 volts. This was for an E4300 at 2.7ghz.
ALso for the different ram sets 800's, 1000, 1066 sets they have different binned chips. They are all d9gmh but there will be a number on the chips like -25f on the 800 and -18f on the 8500. This relates to how good of a binning they are with the -18f being the best you can get.