I have a choice of three phones for my Prius that work with Cingular Motorola V600, Sony Ericksson T616, or Sony Ericsson T637 [I think Nokia 3600 too, but I'm not sure]. Have you folks had any good/bad experiences with any of these? I'm only going to buy one, and I don't want to end up with a phone in my drawer instead of my Prius. Thanks.