I think I can finally say I'm happy with my i7/256. After a week of terrible buggies I took it to the MSFT store and the reinstalled a bunch of updates by hand. Now it seems to work well, and the fan does not spin up as much as I recall previously.
The best part, which most of the Apple-centric media seems to miss, is the ability to switch from laptop mode to tablet mode. Most of them bellyache about how it's too big for a tablet or too small for a laptop but overlook the fact that you can be reading a forum like this in tablet mode, then say "hey I want to post something", and just stick the keyboard on for a few minutes and type a response. Or you are going through email and someone sends you a document to read, so you rip off the keyboard and put it in portrait/reading/tablet mode. I swear I have never seen a review mention this! I think it is because most of them are basically professional bloggers and don't really work with documents the way most of us do.
I have another 2-3 weeks on my return policy, and if I'm happy enough with this I"ll probably trade up to the i7/512 just to have the extra disk space / peace of mind.