I recently purchased & installed a pioneer avh-4200dvd and took out my Pioneer Premier Deh-860mp. What's the least and most I should try to sell it for? I don't know where to start, it probably can be sold today.
I personally love these. I've had two already. Though I wish they were built slightly better (control knobs feel cheap and the faceplate ribbon cable is going to wear down at some point).
They go for $100-200 on ebay depending on condition and included accessories. So shoot for somewhere in that range. They're very popular still, though the P7800MP has stolen a lot of the P860MP's thunder with the color screen and standard aux-in.