In need of new pump, looking for advise!

[The Raddish]

We currently have an Astral pools 1hp pump that is on its last leg. I have been looking at the pump I mentioned above, along with three others.

Hayward Max-Flo Pool Pump ( Max Rated) | .5hp - HAYSP2800X5
Hayward Northstar Pool Pump Energy Efficient | .5hp - HAYSP4005NS
Hayward Power Flo II Above Ground Pool Pump | .5hp - SP1750

Money really isn't an issue, and I'm leaning toward the Northstar due to its claim of energy efficiency and quietness, but I'd like to get an opinion on the three pumps as well as the one recommended by Ben which is getting increasingly more difficult to find (always a concern when a product approaches the end of its life cycle).

HAYWARD SUPER PUMP MAX RATED 1/2 HP 115V

I haven't even considered looking at anything other than Hayward, but I suppose opening my options up a bit isn't a bad idea. I'll take a look at the Pentair 3/4 HP Dynamo 2 Speed Pump as you suggested.

I'd like to know what pump I'm going to be buying in case the Astral doesn't make it through the season. I guess I want to have my research done so I can pull the trigger quickly if needed.