The Havok seems good, it has a sintered rotor which I think is the important part (the bonded rotor motors were lame). I have a 'Pro' 8.5 which is a Velociti style can motor, seems quite powerful at not a lot of wattage, the Havok style should be ok also with the way they are made now. Follow Novak's gearing recommendations with maybe going up one tooth on the pinion from there if temps allow and you should be happy.
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