well... it all really depends on what you want it for.

you'll have to spend some bucks on a turbo kit, reguardless if you go custom or kit.

superchargers provide power throughout the power band... great if it's your daily driver and plan on play'n in the streets.

turbo offers more high end (ALOT MORE), and you also have to worry about turbo lag (the times it takes for the turbo to spool up) and stuff like that.

usually you want long gears so you can stay at high boost longer, so i dont know how the sports shifter is going to effect that.

hope that helps a little.