Instant Messenger of choice?

[I_dream_of_Mercury]

I'm in search of an instant messenger that functions well, is secure, and offers privacy, which includes not collecting your private info, installing invasive-ware, etc. This pretty much lets out the big names, such as Yahoo, MSN, and as I understand it, Digsby. I'm hoping for one that has multiple popular IM's on it, without their privacy violations and bloatware. I've heard that IM plus social networking such as Twitter might even be available.

I'd greatly prefer something that receives offline messages and gives email alerts.

Is it too big a dream?

I'd even pay a reasonable fee, if necessary, as long as there was a way to pay for it without providing private information, such as my name and address.

I'd appreciate your knowledgeable advice!