I think your best bang for the buck is going to be a aftermarket impeller. No one has posted anything about Air restrictor removal, and stay away from those cheap ass chips like that. All they do is change the resistance in a sensor to make it run richer. There is no r&d that has been done, I don't care what the ad says. You can find the same kind of crap on ebay claiming a 20hp increase (come on, really !!). Sorry, those type of people really piss me off.
I would be more prone to look at a programmer, and do the modification to utilize it to it's full capacity, but if your going to do that, wait on the impeller to see if you need a different pitch due to the higher power.