bass and bluegill combo can work in a small pond, just dont expect very many 3-4# bass. You can have a nice bluegill pond coupled with good smaller bass fishing and the occasional larger one.
Plan on feeding the BG heavily and probably fertilize if you plan on harvesting and consuming a lot.
Hybrid striped bass and hybrid bluegill is another option. Definitely plan on heavy feeding; I personally highly recommend aeration if you want to push the biomass. A small pond only requires 1 diffuser and a small 1/4 hp compressor at 10 ft depth.
