On an 8,000 gallon pool, you'd be better off with a 2 speed pump. The variable speed pumps are all max HP motors, that can be turned down fairly efficiently. But, the 2 speed 1HP is going to as efficient, or more efficient than 2.5HP variable speed, turned way, way down . . . and it's going to be a heck of a lot cheaper and more reliable. Texas doesn't have the lightning Florida does, but putting electronics at the end of an power run outdoors is just asking for problems.