White in silkies is recessive, you never know what you will get from them, I had one who was hiding silver partridge aka grey I have read that there are two different types of grey though, silver partridge roo with gold partridge hens would produce silver partridge girls and golden (both silver and gold) boys.If you breed it to blue, black, or splash, you will end up with all blue or black chicks, carrying partridge. Pretty sure white in silkies is dominant too, so you'd get white chicks from that. I *think* gray might be eb based (like partridge), so that might be your best bet, but I could be wrong. You could also breed it to a lavender and start a porcelain project. The procelains are like a pastel version of partridge, very beautiful.
Basically, if you have a choice of any color, you should pick whatever color you want the offspring to have, knowing full-well that they are then color "mutts" and shouldn't be sold to people looking to breed. If you want to sell the chicks, buy a partridge rooster and sell partridge chicks... Just depends on what your goals are!