64-bit vs 32-bit Linux OS
 

I'm wondering if I should go with a 64 bit or a 32 bit install.

There is one domain on my server, and it has one install of vBulletin, Wordpress, and Mediawiki.

What are the cons to moving to a 64-bit system? I hear the 64 is a little faster and can take advantage of +4 gigs of ram, but what are the downsides or what are some of the problems I might run into with the 64bit system?

Thanks,

ww