Ehhh I dunno, I don't see much that TeamSpeak has to offer that IRC doesn't, beside the "private" server and Voice Chat. Call me Biased, but I'm liking the IRC set up, it's easy enough to jump into and start chat'ting, and it's not tied to HJU server so if HJU were to go down on us, the Chat wouldn't be affected.
But I'm just one Biased mIRC user here >_>