Turbo's are alright, and can increase MPG if you do alot of highway driving....problem with turbo's is boost spikes, turbo lag, bigger the turbo higher RPM you gotta go to get it spooled fully, etc.
Front turbo's will kill wanting a "low temp" engine bay because they get fuckin hot,
(STS) butt turbo's seemed great at first....but if you live in a dusty area, your gonna hate cleaning the filter every couple of weeks, there's alotta oil lines running everywhere, an excessive amount of weight hangin back there and im sure if you hit a big enough potholes the hangers would fail and you'd loose your turbo.
Radix is just over-rated, they dont make near close enough to the same amount of power a whipple or Kenne Bell can for $700 more. Don't waste your time with magnacharger. The whipple is a solid unit, but Kenne Bell's new big bore TS is a way better option.
Twin screw's/Roots are both on-tap all the time power, and will do a much better job of increasing your tq/hp lines in a nice line on the dynograph. only cons to a roots/Twin is that you'll lose some MPG, but can makeup for it with a dyno tune and might see a lil extra MPG than before with today's tuners.
Thats how i see it,
Dave