I figure this kind of thing always revolves around what kind of budget you have. I'd say to get at least 3 girls for him, you already have one normal to breed him too so at least 2 others. I'd go for one female with a gene in the yellowbelly complex, every another yellowbelly would be good just to get ivory, pastel ivory, enchi ivory, etc. It would be hard to tell what was just plain yellowbelly with all the other genes but I don't think that would stop me. If this was a BEL gene I probably would though.

A clown combo sounds great too, but I'd probably only get a clown combo if I could afford it along with at least one other snake. I wouldn't want to blow my budget and then have the clown female just not care about locking or just not ovulating. Leopard is another gene I think would look good with that male.

Of course the higher the budget I'd probably add 1-3 more females, but I'd also start looking for females like what I said, just adding a few genes here and there.