i think you should just put a reminder that these builds dont include OS. People can then choose what type of OS they would want. I dont think everyone needs Win 7 Ultimate nor 64bit if they are getting a build with only 4gb.
Im going to be building a comp once the holidays start. Im planning to go for a 2 GTX580 in sli. However I read that Nvidia will be planning to release their 600 series in early next year. Will it be worth the wait or having 2 GTX580s will last me many years to come? Im planning to play in 1920x1080 if that helps