I'm leaning more toward a TVS from Mag' or possible a Whipple. I know that Whipple goes up to something like a 2.8L but Mag' with the TVS only up to 2.3L. I've read and seen many Procharger systems and like them too, but I like the more traditional looks of a roots/screw-type supercharger. If I fits under a G8's hood I think it'll fit under our Camaro too
Turbos are a good alternative, I just lean more toward supercharging for packaging and controlability.