Personally, I would stay away from the 64 bit side until much more drivers are made available. Drivers can be found, but many are not quite up to speed. I should mention that the HP ZV6000 weighs about 9 pounds and makes an excellent DTR, but at this weight it is quite a bit to be carrying around. If you are looking for a quite and cool running laptop as a desk top replacement, the ZV might do quite well for you.