Remember, if you are able to get a 2-speed pump, or just a replacement motor, you will also need to get a timer that will change the speeds and need to rewire the system correctly. An Intermatic P1353ME will do the job and fit into a standard Intermatic box. If you aren't very familiar with electrical wiring for pool equipment, you are better off hiring someone who is. These are not "plug-and-play." They usually run about $300.00 online.
You could also install a V-Green 2.7 motor, I've done it. You can't use the V-Green 1.65, your impeller will overload it and burn out the motor.