Induction kit - people generally go for the Neuspeed due to cost.
Rev D Diverter valve as the standard generally fails and you loose boost.
Audio - Headunit, door speakers sub (maybe)
HID headlight bulbs - H7r Canbus
Remaps.
Suspension - a LOT of people on here go for the sportline springs to get a subtle drop. If you want a "stance" that isnt "off-the-shelf" then go for coilovers. Also have more options for handling too with coilovers.
Exhausts - not really looked into this, but Miltek is a firm favourite with SCN.
The rest is up to you. Modification is individual and as such...only you can decide what to buy and style
Welcome aboard buddy, we're all a nice bunch and I'd like to say; not AS prejudice as other forums are.