I personally would go the turbo route. Reinforce the motor by re-sleeving the pistons, porting and polishing, blue printing, of course new cams.. Wont be much need for a CAI (cold air intake) if you do buy a turbo so, buy a nice turbo after you have reinforced your motor. You could push 20+ psi easy if you strengthen things right.
Also if you have any cash suspension is always a good thing.. this is assuming that you havent done any thing to it yet. I am a fan of Skunk2 coilovers, but everyone has different opinions.
thats my .02
__________________
|