Personally I would be doing these:
- The usual mods (exhaust, intercooler, pod or panel filter (your choice).
- Oil cooler
- Good tune
- Coil overs
- Sway bars
- Strut brace
- Decent tyres
- Brakes (rotors, pads, oils, braided lines etc)
Do a track day with these mods and then see how you are going.