What kind of supercharger, roots or centrifugal?

Also, how much power are you shooting for? If you're just going for a modest power increase, you can keep the turbo on the sane side and keep pretty damn fast spool, especially if you go with a ball bearing center section. For around the same price, you could get a small ball bearing turbo and have fast spool or you can get a larger sleeve bearing unit and have more power but at higher RPM. You've already got fairly good torque down low, so you could probably go on the bigger side and have a great setup. Something around the size of a GT28RS would be sick, but a bit more $$ than something like a T3/T4.

The question is really what you want for power, and how much money you want to spend.