I think a Muskie/Walleye/Perch/Fathead combo, that might work well in that 1/2 acre you have.
Maybe a bait pond? For fatheads or golden shiners or some panfish specie. Or koi or something for ornamental purposes. What do you want for it? You could always try a small scale classic combo - largemouth/bluegill/fatheads. I can't think of anything else.
