I would also suggest DDR2-800. With the high overclockability and relatively low multi's of the Core 2 Duo's, you can hit a high FSB pretty quickly. So with that, you'll want RAM that can keep up at 1:1.
This looks like a pretty good deal, I want to get two of those sets, totalling 4Gb, but what about those speeds? I want to overclock this thing to FX-62+ speeds which shouldn't be too hard, I just don't know what kind of ram to get.
Errr isn't the fsb for conroe up at like 533? If so the purpose for running 1066 ddr2 would be to go 1:1 on the ram divider.... It probably wouldn't overclock much though.