An electric Taurus must be great! I think the modern electric drives are in some respect similar to the old glow drives. If you have the same power, the electric drive will weigh about the same. It is even better because it saves the hassles (I think you know that better) and gives a better flight behavior (because an electric motor matches a propeller better than a glow engine).

From calculations made for other models a while ago I might suggest two example drives:

AXI 4120/14 motor, suitable 40A ESC, 6000mAh 5s2p LiPo battery, 12x8" APC propeller.
Weighs 44oz, runs 10+ minutes. A bit heavy, but ballistic for a Taurus.

AXI 4120/12 motor, suitable 30A ESC, 6000mAh 4s2p LiPo battery, 12x8" APC propeller.
Weighs 38 oz, runs 15+ minutes. Still quite heavy, but maybe better for a Taurus.

The configuration could be fine-tuned (e.g. using A123) spending some work on it.

Just my thoughts...