Car stereo?

[judgesmails]

I have about 80 GB of music on an external hard drive. My car is older and I want to get a new stereo for it. I want to find one where I can just plug my external drive into a USB port and play music from it. When I told a couple of salesmen this at Best Buy and Frye's they just got a blank stare on their face and said they did not think they had anything that would work. Some of the stereos had USB ports, but they said they did not think my external drive could interface with the stereo.

Any suggestions on what product or products I should be looking at? Thanks in advance for your help.