BuddyPress.org

I really love to use the activity stream as a chat. Included the RS activity stream refresh and all my users love it to. I believe that it uses ALOT of cpu power so i wanna try to find something new. I dont want chatrooms or stuff like that, but a good chat thats not som resource needy that i can run on a full page perhaps. Discussing football and betting it can get speedy at times and alot of input. I want something that looks very clean and professional..
Anyone have any ideas. ?
I have no problems paying a bit for it either, so it might aswell be a chat running from another server but most important is that it interacts with my userdb