Definetly go turbo. They are much more efficient when it comes to creating power. Superchargers run off of a belt which steals horsepower away from the engine the same way an a/c compressor does. With turbo's you can also easily adjust how much boost you are running. With a supercharger you cant adjust the boost, (other than buying different belts) and you only get maximum boost at redline. With a turbo you get however much boost you are running the same thru all the rpm's. I have also found that you can get a very good turbo for about the same price as an average supercharger.