Totally personal preference on this one. Don't forget that yellowbellies, lessers, cinny and black pastel also work well with pastels. I myself am going for a silver streak this year (black pewter x pastel) and hope next year I can go for super pastel ivories (pastel yb x pastel yb). If I can hit on any of them, I can alsways breed them back to a spider or pin or spider/pin combo down the line.