Slojoeguam:
When I play, I shut everything down except the WGT client and Skype
I use C3 voice chat and if you search the web: e.g. "skype + CPU" you'll find that people don't like that it's a 'memory hog'. Researching lists of best voice-chat programs, I always see Skype on the bottom.
I also like C3 because you can make dozens of rooms, it's easy, and each room is assigned a phone number so people w/ cell phones can call in and join the chat without downloading the program. That's what Yancy does when I stream on Twitch and record the shows.
I have Teamspeak for back up. They have public servers (not an issue w/ C3) and you can join a server for free if you search one.
voice chat reviews:
http://www.makeuseof.com/tag/3-free-voice-chat-programs-pc-gamers/
note a comment:
"it’s sound is almost as good as skype without being such a bandwith hog"