Looks like you have the right idea on mod selection. They all look great. I would buy all the stuff that requires rejetting at once such as the FMF fattys, K&N, v-force reeds and the single carb ( finances permitting). This will save you time from jetting after each mod. Then I would look at the cool head option with around 20cc domes, no smaller unless you don't mind running race gas (pricey), and some timing advance like an adjustable timing plate. If you do all your riding at 3 to 6k elevations you should be fine with 19cc domes. As for the Lightened flywheel mod, this is great for duning, not so great for dirt allowing a more prominent powerband kick which can cause you to loose traction. A smoother powerband is what you want for MX and trail riding. I would stick with the stock gearing till you get a feel of the mods.