I didn't feel like this question was directly addressed so I will say something to it. Initially I was confused with the talk of the new "thermostat" because I was thinking of the coolant thermostat. These are two different t-stats.
The one used for the e-fan setup goes between the fins of the radiator. It sends the temps to the fan controller and the controller turns the fans on at the set temperature.
You still retain the stock t-stat for the coolant system.
I like this method best because it would be cheaper for me. JK did his for under $150 (I think).
Now, if I had the BB tune like the OP then I would go with the 05-up fans. Not everyone can live the yukon/tahoe mod dreams.
