Seriously, x64 based is useless at the moment, due to majority of the software not supporting and it need more resources for your system.
Obviously, 34bit with same processor and 4gb RAM will be faster. Correct if i'm wrong.
But you will regrets when some "outdated" software not running on your computer.

This post has been edited by shinnyx: May 14 2009, 12:18 AM

Personally I'm using vista x64 also, some software are just not supported on x64 platform and I have to use my old PC as alternative. I think if u're not concern about the "outdated" software and drivers u might just go for x64. Indeed, x64 is a more stable platform.

This post has been edited by shinnyx: May 14 2009, 12:30 AM