I have a Ventrillo(Voice coms) server that sees little action that I'd be happy to let you guys use during your game if your interested. While I ended up leaving the FPS clan it was originally intended for, I've had a blast using it during my weekly AoK matches.
You haven't heard smack talk until you've heard Brother(teamed with father) against Sister (teamed with husband) going at it in voice coms during a heated RTS battle.
If your interested let me know and I can set up a couple passworded rooms for you guys to use. It can handle up to 15 people I believe.
-Eilim