Supercharger Kit

I have a 2003 v6 automatic mustang, I already have dual catback exhaust and 4.10 gears and a sct tune. I decided I want to make some real power by supercharging my car. I was looking at the m112 supercharger kits and some pro-charger kits but its hard to find a kit under 4 grand. I am willing to spend 3 grand but that's about it. Does anyone know where I can find a reliable, safe, and decent quality supercharger kit for around 3 grand.

I was also wondering if you guys think it would be worth supercharging a 3.8L automatic. I think it would be cool to have a "sleeper" and I cant afford the insurance for a gt so that's why I have a v6 in the first place.