Madgame, I assume that you must have several suction and return lines at 1.5" in parallel. If not, as Zina pointed out, 2 HP would be way overkill.

If the pump does not also run a spa, water feature or cleaner, you can probably go with the 3/4 HP pump. Otherwise stick with the 2 speed.

Also, you can do it for cheaper only if your willing to install the pump yourself. Otherwise, seems like a pretty reasonable price.