Memory on 32bit machine

Hi,

i have the option to upgrade to a new dedicated database server with 8 GB Ram
i want to run on debian linux 32bit because i had some trouble the last time i
used 64bit with iptables which did not work (i guess it was a year ago...)

8GB are addressable as far as i know with a bigmem kernel.

Does it make sense to run a dedicated postgresql server with 32bit linux and
8GB RAM?

Or would you rather vote for 64bit because there are no problems anymore and
postgresql runs fine on 64bit debian.

So assuming i could choose between 4 GB RAM and 8 GB RAM and 32bit debian and
64bit debian. Which option would you choose?

If you recommend 64bit (and obvisiouly 8GB), are there any pitfalls or hints?

kind regards,
janning