[Serusers] slightly OT: client to work with SER

All, I'm trying to find a decent client to use with SER. The server is all set up and clients can make/receive calls, but there are a few options I would like to have. I need clients for at least Mac and Windows, preferably open source and relatively cheap. I've tried SJPhone, Xlite, Windows Messenger, and Mirial. None of them will pull down contacts that were set up on SERWEB when I register with my SER server. I wouldn't mind having a video option, but it's not required at this point. Anyone have any luck either with the clients I listed above, or use a client that would work? Thanks in advance, Jeff