I've also searched for a long time for a unit that has android built in.
But most people don't recommend touching those Chinese units, The UI is ugly, the android version is Gingerbread, they are very slow & the most important thing - the sound quality on those units veeeery bad !.
I've stopped my search on Pioneer AVH-X8500BT (Or X8500BHS for U.S.), This unit has AppRadio Mode that through little app called arliberator can mirror your device with full touch compatibility so you can enjoy full android that is on your phone on the 7" screen !
You can also have the cut out version that doesn't have all the USB, AUX, CD and what's more functions, and is cheaper - called AppRadio 2 (SPH-DA100).