When selecting pond equipment, you should seriously consider the cost of operation.
Each amp can cost $103 per year based on a dime per kilowatt hour.
What does your local utility charge per KwH? You can look on your bill and find out. Most of your cost comes from running your pump, so be sure to choose the right one.
Other costs can be from lighting and bubblers. If you choose the right equipment you can keep your electricity costs down. Consider solar power for free pump operation.
In general, the more expensive the pump is initially, the less it will cost to run. Also take the length of warranty into consideration when buying any pond equipment.