1. Tires
2. Save for supercharger if you want more power.
3. Anything else to make the car handle better.
It's a total money waste to buy an intake if you plan to get the supercharger. The intake will be useless after the sc install, so you'll be selling it at a loss. The intake will not make a significant difference in power, the sc will. Some intakes have been shown to actually reduce power.
It's up to you, but IMHO, you'd be better off either saving for the supercharger or putting better tires on the OEM wheels. Wheels and tires are even better, but they cost a lot more money.