Might consider the 1066 because running DDR2-800 on a 1333 FSB, you will either be running it at 667 or 832 which is outside the spec for the ram. Most high quality ram should be able to handle the slight overclock just fine though.
The thing is, the stick that is the 800mhz DDR2 runs at 4-3-3-15 latency on an nForce 680i only. On a P35 chip it runs at only 4-4-4-15. So would it be worth getting an nForce 680i board as well. Or just getting other ram?
Can anyone suggest other alternatives as well as the above?
Crucial Ballistix can do a wide range of timings & speeds. I can do 800MHz 3-3-3-8 @2.1v, 1000MHz 4-4-4-12 @2.1 or 1200MHz 5-5-5-15 @2.2v. The Crucial dimms are some of the best overclocking RAM out there.
as i said get 680i if u sli and as i said get sli if u play @ 1920x1200 or higher ,if not save some money and get a nice p35 board like ASUS P5K, ASUS P5K-E , GIGABYTE P35 DS3R(they support only DDR2) or ASUS P5KC or GIGABYTE P35C DS3R (They support both DDR2 and DDR3 ,although DDR3 is limited to 4gb and these 2 boards dont OC as good as the others )