Forall,

Do you have your NAR or Tripoli High Power certifications? For the weight you ate projecting, you will need a minimum of a J class motor, more likely a K or L. For any of these motors, you need a High Power Level 2 Certification and for anything above a J570, you will also need a BATF Low Explosives User's Permit, unless you go with a hybrid.

For more info, check out www.nar.org and www.tripoli.org

Rob