Platform for running Postgres 8.4

All,

We currently are using 8.4 on a Windows 2003 and 2008 server.  While all is fine and we are rebuilding some of our older db servers we are considering moving one of the servers tp a Linux or Solaris platform.  I don't normally ask this kind of question because of this can be a very personal decision, but what we'd like to know is what is the best Linux distribution to run PostGres on.  We are not going to be running anything else so we don't need all of the fancy bells and whistles that the various GUI's bring.  We want this to be a mean and lean machine. The hardware will be 2 dual core XEON processors and 12 Gig of RAM.  Our db is about 1.6 gig running on our Windows server. 

I would like some comments on which Linux distribution to look for and why.

Best Regards