I needed to install Win 7 three times when I built this machine, for various reasons. It sucked to need to reinstall it two extra times and it took hours with all the programs and stuff. But on the other hand, now I don't see a need to do it again for the foreseeable future and there's nothing in the back of my mind telling me everything's not right. If you now stick to the 32-bit just because of avoiding a few hours of work, you might find yourself regretting it many more hours down the road in the future.

Like they say: If you do something, do it properly.