We have both just gone post sear, so we're not looking for tactic heavy conversation in HoH or anything, it's just so we can chat while we wander around
kinda like that Rocco...only in CS it's a direct peer to peer to peer connection. Teamspeak uses a voice server. while CS just opens an audio port on your local machine.
both Ventrilo and TeamSpeak can be hosted off one of your computers. One of you runs the server and then both of you run the client and you won't need to pay for a server to host you.
We use TS and Vent quite a bit for Mechwarrior. They are both going to work well for only 2 people. I suggest enabling PTT. There is also an old program called BattleCom out there that is free that should work well if you can find it.