What's your budget?
I would go with
Banana Clown
Leopard Clown
Fire Clown
Enchi Clown
If you want to stay at $1500 and under
If your budget is more same thing with an extra gene or two
If your budget is much less you will be limited to Clown and Pastel Clown, I would not recommend "insert morname here" het clown simply because it becomes a long shot, the possibility of producing clown and lesser clown will be lower and you really do not want to be dealing with a bunch of poss hets, it's hard enough to sell hets.