Opinion question (Core2 Duo)

[Zaq Rizer <idhindsight@gmail.com>]

I have an Intel Core2 Duo arriving in the mail in a couple of days, and 
I read online that these processors can run in either 32bit or 64bit 
mode (just like Athlons can).

Thing is, the 32bit chroot and ia32-compatibility libraries, are, imo, a 
total mess and a real pain in the rear to deal with on a daily basis.

I'm looking for people's opinions on whether I should stick with 
debian-amd64, or do a reinstall of debian from the main branch (32bit)?

What, truly, are the real performance differences?  Simply support for 
4+G of ram, or something else?

My /home is a seperate partition, as are my mp3s, etc etc, so data 
retention is not a huge concern.

Thanks,
Zaq