My P.I.E. unit is the CHRY04-AUXS. Mine has only the dual RCA jacks for hooking up any audio out (usually after adding a mini-din adapter cable). I can't use the radio buttons to control devices attached via the AUX port. Since I have an XM RoadyXT, a Creative Nomad Jukebox3, a Dell DJ-30 or a Sandisk C250 that I can attach to the port, that functionality isn't missed. If I owned an Ipod, I'd be looking at the same model you're eyeing.
If you do take your PT to a stereo installer, make sure they know about the screws in the vents. I've heard of more than one case of damaged bezels when the guy tried more leverage because no screws were visible so he assumed it was all just press fitted.
