I, personally, would stick with ocellaris clowns. One black and one of the orange and white clowns.
i like the peaceful ones. I would suggest to stay from clarkii, maroon, and tomato clowns as some can be absolutely ruthless! As always, it depends on the fish. ![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)