I am a firm believer in small pumps and large pipes. Unfortunately, many pool builders do the opposite. There are some exceptions. If you have a spa, water feature or pool cleaner that runs off the same pump as the filter, you may need a higher HP pump. I would then go with a 2 speed pump.

I would target an 8 hr turnover which is about 83 GPM. If you go with 1 1/2" plumbing, your head loss could be as high as 60 feet. With 2", which I highly recommend, it will probably be closer to 50 feet. So depending on the make of the pump, you could go with a full rated 1 HP pump.