Depends on what you want to do with it.
I'd think the ford full suspension kit (shocks/struts, springs, sways) and the performance pack 6 piston front brakes.
Or you can start with a performance pack car, $2500 has the 6 piston brakes, Torsen rear with 3.73, upgraded suspension, larger radiator, different stability and TC programming, staggered wheels, summer tires etc.
The problem with the Torsen/3.73 on a supercharged car, most prefer the 3.55 or 3.31 for longer in boost situations, and better 1/4 mile abilities in 4th gear vs 5th. Hoblick is switching to a 3.31 because of this.