Have you considered the 1hp 2 speed SuperPump from Hayward?

Mine's been running into its 4th season now, mostly on low, and I use it with a 200# Hawyard sand filter with no problems on either low or high.

It's a 220v pump and surely is PLENTY big enough for your pool and won't overwhelm your filter. I don't know Pentair, but I've never heard anything but good about them, I just know I'm DELIGHTED with my 2 spd SuperPump.