Buff Orpingtons have gold not silver, so the hens cannot be used to make red sex links. Buff Orpingtons are not barred so the hens can’t be used to make black sex links. Out of luck there.
According to the chart in the first post in this thread, Orpingtons should be slow feathering. That means you can cross the hens with any of the fast-feathering breeds in the left side of that chart to get feather sexed chicks. I’m very cautious about depending on that because the birds are not always as pure for the fast or slow feathering gene as they should be, but at least you have a chance that way.
There are other ways to sex chicks too, like leg color, but I’m not familiar enough with those methods to know if there is anything along those lines you can use with Buff Orps.
Great can mean different things to different people. Cross a Buff Orpington with any other dual purpose breed that you think is great and you should get great chickens.