You might also talk to your F&W dept along with thundermug suggestion. Some F&W will actually come out and look at pond and advise on what to stock,pond plants etc... I would think/guess a mix of Bass,Crappie,Perch would work and be fun to watch grow as the Bass will tear up Crappie but should leave enough for some real trophys to grow.They are somewhat of a prolific breeder.Same with Gills.

I would think the Bass and Catfish would wipe out the Trout?

If Mr.Catfish gets big enough they will compete/eat everything in pond. Also watch out for invasion of local snapping turtles - they will clean out a small pond in short order.Fish,Ducks - everything that draws breath, they will eat!

Good Luck