[Induction Concepts]

As others have said, if cost is not an issue, get the supercharger.

BUT, what I would do is get the gears first, since you're only talking a few hundred bucks. It will definitely make an improvement in the seat-of-the-pants-o-meter and its cheap.

THEN, if that isn't enough, you could go for the supercharger.

The lower gears (higher numerically) will affect fuel mileage, but I'm guessing that isn't much of a concern.

If it turns out that the gears alone aren't enough, and you add the supercharger, you may want to put the stock gears back in because the SC will give you the power that you want, so why lose the extra mileage of the low gears, plus the SC will decrease mileage itself from parasitic losses. So don't give your stock gears away until you decide for sure.

Gears won't hurt performance with the SC, in fact they will improve it over just the SC alone, but you may decide you don't need/want both, and you can always sell the lower gears pretty easily.

Gears are a great bang for the buck.