Good information guys.
I'm definitely doing this, not sure when though. Like someone else said, probably won't be until I overhaul the cooling system. Hopefully that will be before it lets go.
Anyways, I'm thinking about leaving the aux pusher in the front, and installing another puller run by a relay on the engine side. I would probably set it to run on high or low anytime the ignition is on. I'm not a big fan of the temp controllers. This won't be the cleanest install, but I'm not sure I trust the single electric fan, like other have pointed out.