I have a 2012 Tahoe with the rear seat entertainment in it.  I want to get an NEX head unit but I can't figure out which one I need.  I want to know which model starts with the rear source option.  I don't need a ton of features, so I guess I'm looking for the cheaper ones.  I know the models like 2400 and 2300 etc have  all the inputs and outputs, but can I play a different source in the back than the front with those?  Thanks for any help, Ive gone crazy trying to figure it out just by searching the internet.

Pioneer 4000 to 8200 series. The newer pioneer remove the dual zone control.

Thank you for that.  That sent me down the right road, but kinda disappointed that it seems only a few of the 4000 series units have the rear zone. Looks like if I want a newer one I'm stuck with a 4400 or 4500.

4400 and 4500 dont have rear output control. they just have output but no control.

Pioneer's website says it does, and the unboxing videos on YouTube show the rear source selection in the list though.