What next?
#6
<< Do some stuff to the motor. Buy a cam,and a high compression piston for it.
Thats only if you want more speed.
Renthal bars sound good too. >>
That won't add "speed" you would need to change the gearing to do that.
Some good things to start with would be;
*Skids
*Better tires
*bars
*Air box mods
*cam
*piston
After you get the basics then you should move onto A-arms, axle, shocks, braided brakelines, ect.