Has anyone found a good auto heater unit that they have used (or would recommend) for their plane?

My dream unit would be complete with heater core, fan with 3 spd resistor, enclosure with 2 or 3 flaps to open/close for heat and defrost; all in a small and light enough unit to fit under the instrument area of my RV-10.  Any suggestions/auto models??

Phil RV-10 w/20b in chilly IL under construction