[NTLUG:Discuss] Advice? Router/firewall/email server/backup on same box

[Dennis Daupert]

I tried searching NTLUG archives, every page gets 404
Not Found.

I have an old Optiplex, mobo is dead, want to upgrade
and build router/firewall, process email for my local
lan w/ spam and virus filtering, and run a Subversion
server and big harddrive to backup local machine home
directories.

I imagine there are security considerations. Any
advice?

Anybody have hardware recommendations for mobo and
CPU? 

/dennis