Quote Originally Posted by jeremyp View Post
What motor and impeller do you recommend?
The safest choice would simply to be to simple replace your existing motor with a new 2 speed of the size, and add a timer.
B977 motor on this page at A1PoolParts. I think they have free shipping on energy efficient motors till June sometime. And, you need the "Go-Kit"

This timer is what you need (or you can use the manual switch):
Intermatic T10604R Pool/Spa Control Center T106M and T104M
Southwire 55189301 3/4-Inch 6-Feet ULTRA Whip-Pre-Assembled with Wires and Connectors
Leviton 1282 15 Amp, 120/277 Volt, Toggle Double Throw @ Amazon