I would go with just the bore and increased compression. There are many other things like thin gaskets, increased timing, better carb, headwork, cdi, lighter flywheel that will make power without the major engine modifications required to build a good stroker. You can always add a stroker after all the above mods if your bike is still not powerful enough, but as you probably know the more engine mods the more heat, decreased reliability, increase in maintainance, and higher motor octane rated fuel you will have to run. Just try and decide if you want to trade reliability for power. Don't forget we like to ride the quads more than work on them. Hope I've helped.