Welcome mate,, do a search on here for N/A mods, by XXB4XX

Do the brakes and suspension..  then chuck a rex engine in it..  you'll look like a low-key Kosti with more oomph.

Enjoy!

Go the GX!!

My opinion

For show/Bling/Rice etc:

Tint
Wheels
Exhaust (it is an N/A, but will still sound nice)
Front Strut Brace (it makes a difference, but its very very little IMO and looks shiny)
Audio system - NEW HEAD UNIT!!!!!
Lighting - HID's, clear/smoke indicators etc (neon should = ban)

Handling: Can't recommend this enough. I wouldn't go for the anti-lift kit again.. Gets kinda bumpy at times.

Upgrade sway bars, links etc
New shocks (replacement(depending on kms) or after market)
New springs
(or coil overs)
New rotors - ie DBA4000 6x6
"Performance" brake pads
4pot WRX/Skyline (r32??) calipers <-- Ill get some one day

General performance(ish) kinda:

Clutch (Aftermarket HD organic is fine for the N/A)
Flywheel
Read xxb4xx's N/A performance upgrade thread $$$

As has already been mentioned, if you want true performance, ditch the N/A and get a WRX motor dropped in. The gain in power from most "chips" is minimal from what I have seen online. Not used one myself, so I can't really comment, but I doubt the performance gain is really worth the $$