Pioneer AVH-3600
Was the least expensive double-din unit with BT and HD radio (at least when I bought it last year). As you can see, I also wired in a backup camera, which has worked great.
Overall I like it. It sounds great, and the BT integration with my Android phone works like a champ for phone calls and Pandora streaming. My only gripe is that the volume control buttons are a bit of a PITA. In hindsight, I should have spent a bit more to get a HU with a good old-fashioned rotary knob for volume and tuning.