Since you asked, my $.02 is go with the supercharger. Ease of installation, reliability, compact size, and lots of support. It's not "different", but it accomploishes the goal. If you're looking to be different, you're also looking for trouble.
Maybe an LS7 twin-turboed, and a Lenco backing it. That's different, right?
2008 G8 GT PBM, DOD Delete, Pat G Spec'd Cam, 7.4 Hardened Pushrods, Comp Trunion Kit, PAC 1518 Springs, ARH 1 7/8" LT Headers Catted Exhaust, Spectre CAI, Pat G Tune.
412.198hp/396.828tq at the Wheels - Mustang Dyno
1/4 Mile, Very First Run, Stock: 13.66 @ 102.74 w/ a 2.067 60'
1/4 modified 12.49 @ 114
2008 G8 GT MGM, Leather w/ Red Inserts, Sun Roof, 18" Bremmer Wheels
1/4 mile 14.0278 @ 101.49 w/ a 2.2658 60'
DA 2260, Best Run for Lynda