How about a mixed African tank? That way you don't limit yourself. Start with the nice guys, plan to stock about 30 to 40 adults in the 4 to 5" range, and get the mean guys last. Here are some of my favorites:
Lab. caeruleus "Yellow Lab"
Lab. Hongi "Red Top Kimpuma"
Pse. saulosi
Pse. polit
Pse. perspicax "Orange Cap"
Pse demasoni "Pombo"
Pro. taeniolatus "Red Empress"
Oto. lithobates "Yellow Blaze"
Cop. azureus
Cop. borleyi
Cop. trewavasae
Cyr. moorii "Blue Dolphin"
Cha. caeruleus "Malawi Trout"
Sci fryeri "Electric Blue Ahli"
Aul. stuartgranti "Ngara Flametail"
Aul. baenschi "Benga Yellow"
Aul. sp. "Ruby Red"
Cyph. frontosa
Par. bleekeri
Synodontis catfish (multipunctatus, angelicus, decorus, etc.)
These are a few of my favorites. I'm sure I missed a few. Some of these guys will get quite large, but you could always trade them in further down the road.