go turbo forget the super charger and forget the other moddes i have a 5.0 with trick flow every thing and a paxton charger, if i could do it again i would go turbo, at least that way you keep your drivability and make wicked hp turbos a far more efficient than a super charger, think about it have you ever seen super charged ricer latly.
a super charger making 10 lbs boost might fetch you 340 rwhp and the same boost with a turbo would fetch a little over 400 rwhp and a turbo kit is about the same price as that kb your looking at. www.tubochargedpower.com
and how often do you see a turboed stang.