[PLUG] Linux Router Recommendations Sought

[JM]

I'm tired of shopping for the right components on NewEgg only to find that 
X doesn't talk to Linux well, or that I've got to Dremel out a hole in the 
back of the case to allow a second ethernet, so time to ask some geeks 
who've probably bought/built this already...

Looking for a small, relatively inexpensive Atom (or similar) that'd be up 
to snuff running CentOS or Fedora, OpenVPN, and routing and fire walling 
for about 6 machines.

Recommendations?