I'll just type up my experience with gourami's.
I started my tank out with two dwarf's and a blue gourami. They seemed to get along, but then one dwarf and the blue one started to pick on the other dwarf, so I put him in a different tank. He stayed shy and hid alot, and eventually he just suddenly died. Same with my other dwarf. He started to attack all the other fish in my tank, and I went away for a day and came home and he was dead

I still have my blue gourami. He's by far my favorite fish. He's so gentle and fun to watch, especially when he reaches out with his feelers :3 He's about.. three or four inches big? I highly recommend blue gouramis. They have three spots on their sides, and sometimes they disappear and the gourami turns a dark blue.