It's nice 2 go with 64 bit right now for the sake of "Future-Proofing Our PC's."
I really hate the term "future proofing". In the computer world, it simply doesn't make any sense. For example, let's say that it takes 4 years before 64-bit to really become a necessity or a mainstay. I'm pretty sure that most of us won't be using the same PC that we are today, and if Microsoft is still on track we won't still be using Windows 7 either, but it's successor.
I remember years ago when people were upgrading and "future proofing" their Pentium 4's to have hyperthreading or going with the p4 extreme edition. 5 years down the road, regardless of which you chose, you are getting your doors blown off by the Core 2 Duo. So, spending all that extra to ensure that you were "future proofed", has still left you with a dinosaur of a computer that you likely don't want to still be using.