I vote for 64 but be sure all the hardware you buy has 64 bit drivers if so then you should be fine. I will be using the x64 edition myself replacing my pro when I finish my new computer in a few weeks.
Some will try to convince you x64 is not the way to go and that is their opinion but if anyone says home they are just plain wrong as that version will not even take a small advantage (only detects oen processor correct me if wrong) of your processor. Pro can at least take some advantage of it (2 processors non 64 bit though).