We are new to teardropping, but we use heated mattress pads (bedwarmers) in our house to save on energy at night. We find them to be very comfortable and plan to get one for our Little Guy tear. The dual control models are best for us since, just as you described, I like it cool and my wife likes it warm. Thus, my side is set on 3 and hers is on 8.
It seems that the pads use about 100 watts depending on the size (if I have read the specs correctly). However, since the heat cycles on and off it generally uses quite a bit less.
The advantage of the bedwarmer (mattress pad) over an electric blanket is that the pad is under you and heat rises. That means that the heat fills up the space between the mattress and blanket, right where you are. An electric blanket works too, but I don't find it as comfortable.
Hope this helps...
Chuc