Get the new lrp X12 they are just an alround awesome motor e.g bottom/top end. The Orions are quick but LRP have moved on into a new revolution of brushless motors. The next best from the new LRP X12 is the latest speed passion competition 3.0.
Is the motor for 5cell or lipo ?
If you get an X12 they are as faster by a whole turn. So they X12 4.5 is like an Orion 3.5. So be cautious as an X12 3.5 would be equiv to about a 2.5.