for the technosquad

For all y'all geekier than me:

I've been chosen (or rather, I volunteered) to build two computers for my lab. We usually buy computers from Dell, but I'm like, "Blah! Dell is crap! I can build computers for cheaper!" and my professor was like, ":D Oh, okay! If you like doing it, you can!"

So I'm building two new computers.

Here's a question. We don't do anything terribly computationally intensive in our lab. So we don't need things that are super top of the line fast or graphics-pretty. I'd still like something that is of decent quality, will last for a couple of years. Should I get a 64-bit processor since it seems that Windows wants to make the 64-bit Vista shift soon? Or should I stick to good old 32-bit that the rest of the lab uses?

Thoughts?