Here are my estimates,

Current Setup:

1.8 Turnovers/day
200 kwh/month
$21/month


Two Speed Pump (WFDS-24):

1.8 Turnovers/day - 30 minutes on high & 6.5 hours on low
99 kwh/month
$10.24/month


Intelliflo:

1.8 Turnovers/day - 30 minutes @ 2700 RPM & 9 hours @ 1000 RPM
61 kwh/month
$6.36/month


So either pump would save you energy costs and the Intelliflo a little more. You could also save even more if you reduced the runtime to one turnover per day.

Given there is a rebate for the Intelliflo and you can find one with a timer for less than $900, it probably makes more sense to go with the Intelliflo.