What about rams, khulie loaches and your choice of mid-dwelling and upper layer shoaling fish like danios, rasboras or possibly non-nippy barbs, rainbow fish, tetras etc? Swordtails are nice too. Then there's angelfish, corydoras catfish, smaller plecos (bristlenose, bulldog etc), keyhole cichlids, various sharks...
Are you looking to do a community or what?
Is there something you'd particularly want? For example, out of the rams and yellow labs (I wouldn't get clown loaches - I don't like getting fish that'll out-grow their tank soon) which do you preffer?
Would you like a malawi cichlid set-up for example?
Why don't you want gouramies? Besides gouramies, hatchetfish are the only common species of fish that'll stay near the top layers almost all the time.