I'll go along with Ron for my top choice in an inline. The Omega action is a thing of beautiful simplicity with some of the virtues of a break open (i.e. short action, easy breech plug access) and some of the virtues of a bolt action (i.e. one piece barrel & action bedded in stock, no hinge pin issues). And the X7 model is sweet.

As for traditional, like Cayuged I lean more in that direction these days. But I've gotten over my need for a custom build. The .54 Lyman Great Plains flintlock suits me fine. I just wish they made one in .58.