I would do(as a street setup):
1, Short Throw shifter
2(or 4). Cat Back Exhaust+Xpipe
3. Gears+A handheld tuner
4(or 2).Springs, Shocks, subframe connectors, Rear LCA's, C/C plates, and Alum rack bushings.
5. From here on out you are wasting money unless you go fi in the power department...