Welcome to PB, Levon. Check through the site and you will probably change your mind about the crappie. They can ruin a water hole of less than about 25 acres.
Lots of bluegill lovers here. However, without bass for a predator, they can, like crappie, also over spawn and stunt. Successful ponds with big BG usually have way too many small, runty bass to keep the small BG knocked back.
You might consider some Channel Cats, Shellcrackers, and Hybrid Bluegills. With a good feeder or two, you can have a really great pond. As you catch the cats and hybrids, restock them. They're not all that expensive.
Or, there may be other ways to do it. Anybody?