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Overboring or stroking a 9 is a bad idea, pretty much every story I've heard involving that ends in serious mechanical failure. I've heard hi-comp pistons and gaskets are OK, but where you can find them for a 9... ? Another problem with the 900. Parts are a bitch to find.
In reference to the air shifter VS quick shifter, it depends on what kind of riding you do. If you're moving to strictly drag race, then go with an air shifter, but if you plan on track (or street?!) racing, go with a quick shifter. A matter of weight and convenience. The air shifter is (relatively) big and heavy, but turns your bike into an "automatic", shifting at the push of a button or at a set rpm, the downside being adding the mechanicals to do the shifting for you (weight! cost! + it's boring imo!). The quick shifter is (simply put) a little sensor that cuts spark for a fraction of a secong as you begin to apply pressure to the peg, making for a quick shift. Depends on you're needs, also, quick shifter are MUCH cheaper, as the most expensive cost less than the cheapest air shifter, also it's less demanding on the mechanic to install.
Also, just curious, are you willing to split cases, how far are you willing to go (work/spend) to make this thing that much better. And what are your goal and playing field. The track? The street? The strip? Everything? Those are some factors other would need to know to recommend stuff. Good luck!
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