YMMV and be sure to read this with a grain of salt on your foreskin...

I have an electric Taurus fan on mine. Had it for 2-3 years. Did it because it's what I wanted to do. Everybody told me it probably wouldn't be as efficient as the viscous fan or that I might have problems with it. It's fine and I haven't had any problems with it. I'm replacing it this weekend because the motor started dragging a bit. Or at least it sounds that way. I use a Hayden controller to tell it when to come on and turn off. If you'd like a schematic, let me know, it's real simple.

Bottom line, if you want to do it, do it. You'll figure it out pretty quickly if it'll work for you or not. You may find an alternator upgrade is in order, which won't be a bad thing for future plans anyway.