What cell phone should I buy?

I'm switching to AT&T; and need a new phone. At the moment, at least, I won't be buying an iPhone. What phone should I get? All I care about is call quality -- I want the sound quality of the phone calls to be as close to land-line quality as possible. If there's a website with good reviews or forums, let me know that, too. (On a side note: why don't any phone manufacturers realize that sound quality is important to their customers?)