More HP doesn't result in more cleaning--it results in more stress on your filter, possible damage to it, and loss of filtering effectiveness. Yet pool equipment providers like to push HP because, as car buyers, we think "more" is better.

Before you buy, I'd like Poconos or one of the pool professionals to see this. Your fix to your pump may be cheaper and easier than you think, but I'm not the one who is expert on it. It may be as simple as a new bearing, or new brushes and a cleaned-up armature, or even a lubrication issue. You may even be able to replace just the motor and continue to use the pump.

Still, if you go for new, why would you replace a 2 speed Superpump with a 1 speed? All it will do is waste electricity and reduce your options. Hayward's Superpump line includes a 2 speed 1 hp unit--mine has been running for 8 years now and runs mostly on low speed.

Just my thoughts.