My advice is, since you already have the Blaster, to keep it and use it. The 300 is going to cost alot more to build. The Blaster can always be made to be faster that the 300. I would start with the shocks, a-arms, and rear swing arm. Then do the motor work. If your use to riding 2 strokes, then they shouldn't wear you out. Yea you have to work the clutch and gears more, but if your use to riding the Blaster anyways, its no big deal. I like both of ours, but the blaster has soooo much more potential.