Ok, I've been looking at Hayward pumps and it seems like the Power-Flo XL and Power-Flo Matrix are popular for above ground pools and the Super Pump popular for the in ground pools. The price differs greatly between the same "HP" rating in each. A 3/4 HP Super Pump is more than double the cost of a 1.5 HP Power-Flo. Do they just make these HP rating up? It makes choosing a pump more difficult.