At least 2 posts have suggested INSULATED heated gear. I wish I had read these before my purchase.
I have an Aerostich heated jacket (not the AirVantage like SMSpiff's). I occasionally use it alone and it's a very good wind shell with some insulating capability. And the pit zips align with my shell pit zips so I can quickly ventilate when the temps warm up.
BUT about 80% of the time that I use my heated jacket I wear an insulated jacket over it. It's all very versatile, but an insulated and heated layer would be so much simpler.