Like I said, price limit and power goal? Some kits aren't going to meet certain goals, some kits aren't going to meet certain price limits. ("best" describes something that is the optimum choice for a specific person, there is never a "best", in the automotive world at least)
I voted the single turbo. It will be my choice. I don't like all of the belts and pulleys that come with superchargers. The idea of moving air sounds like a better theory to me.
Either way, you're looking at needing a TT kit for 500whp or you're going to be pushing your single turbo or supercharger really hard. Also, if I were shooting for over 425, I'd upgrade internals before everything blows up.
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