Urban Guy bet you didn't know you were going to have so many options once you asked this question hey???
With your pond only being 5 feet or so and you have to have your fusers off the bottom at lest 4 to 6 inches don't make this to hard for yourself. My setup will work in your pond just fine for what you want! IMO at 5 feet anything else is overkill. Have fun with it and let us know how it goes.
RC