Which stage of twin-turbo/twin-supercharger kit should I get?

[Nuc370z]

Hi,

I recently purchased a 2014 Nissan 370z w/ Sport package and I must say, I love it and wish to modify it by installing a forced induction mechanism. My budget is $20-25k so I am planning on rebuilding the engine first. Then I plan on installing a forced induction system, but I currently have an issue: I wish for it to be street-drive-able (I need to commute to college and back without feeling nauseous) but also be a weekend drag-racer. So should I choose a twin-turbo or twin-supercharger system? I looked at some builds and want an efficient (fuel-economy) system that can also be of high-performance when necessary (drag strip). I am currently looking at either a twin turbo kit by
GTMotorsports:
GTM Motorsports*::*FORCED INDUCTION*::*GTM-370Z-(TUNER) TWIN TURBO KIT

or a GTMotorsports twin-supercharger system: STILLEN Supercharger System - Polished 407772P | STILLEN

or just a single supercharger by Stillen:
STILLEN Supercharger System - Polished 407772P | STILLEN

So which one should I pick? And if you recommend a twin-turbo system, what stage/horsepower should I buy? eg. Stage 1 500 HP-Stage 6 1200 HP and what PSI should the wastegate spring be set to?

For the twin-supercharger system, which stage/horsepower and pulley size should I buy?

Thank you!
Nuc