^^ Depends on your intent of what you want to use it for? Wheelin? Snow car? General driving?
My first thing I would do personally is color match the front window tint.
Superchargers are amazing and a pain, as the upgrades really start to snowball.
The 7th will get you more power, but you'll really notice it with a 2.2 pulley. You'll also benefit from getting an AFR and boost gauge, to help with tuning. Then valve body work on the transmission may or may not be needed to prevent slip.