1. maintenance on stock KA
2. tires/wheels, FN, work, blah, go with what works and with what fits your budget
3. brake pads and fluid, screw big brakes, I'll never understand why people upgrade to big brakes when they don't even fade their stock brakes
4. coilovers
5. track day ftw.

This way you'll be unique and part of the 5% of 240 drivers that actually drive their car and not just go to meets in parking lots and talk about how much power their AB20CDET makes and how JDM their coilovers are.