I bought a JVC KD-S33 about a week ago at Walmart for $120. Its buttons light up red and match the interior. Not only does it have two preamp outputs, it's ipod and satilite radio ready (Sirius or XM). So, when I get around to it, I'm getting an XM tuner and getting that all hooked up. Any head unit with similar 'satilite ready' claims, should accept a tuner and allow control from the head unit.

My sister had one of the old Delphi portable units in her Taurus a couple years ago. While I loved the XM radio, I find the portable units to be too gaudy for everyday car use (which would probably be the only place I'd use it).