If you want high expression of white in a Calico combo then go with Enchi or Spider. OD also seems to push toward higher white expression. Pastel combos push higher as well but also tend toward disrupted pattern.
BluEL complex, BlkEL complex, YB complex, and SuperBlk complex seem to push toward lower expression of the white. Likewise Clown and GStripe seem to cause lower expression. Most of the Calico Pins I have seen have not been particularly dramatic either.