Depends on what your priorities are. If it is flat out speed, then go with a supercharger. A few things to MAKE SURE you do when you do this. Allow extra time and money to fine tune your system. Most importantly, with the extra speed comes the responsibility to stop too. So an upgrade to your brakes is mandatory. Brake lines, fluid, BBK etc. Also, you will need to attend to any issues to your engine due to mileage. Get all of your maintenance done and out of the way. Gaskets, vacuum lines, everything!
Have fun!!!
Johnny
2004 Imola Red over Black Leather. 6-MT, Navigation, Cold Weather Pkg (the wife loves them seat warmers!), 3.46 Diff, UUC Short-Shift Kit, Tranny Mounts, CDV Delete and iPod mount.