I installed a Power Acoustik unit PD-718NB this spring and am very happy with it. I was obsessed about getting a unit that had the following: Bluetooth, GPS, SD Card for music, and decent sound.

It had to look good though and I think this unit looks like it belongs in our car. I will post some pictures soon so you can judge for yourself if I have accomplished that. It also offered a mark improvement in the sound quality.