If you're thinking about an alpine-style touring binding (as opposed to tech/randonee), why not just get the salomon guardian? It has a lower stack height than the duke, and if you'd be buying your sth 14s/mfd new, a new guardian would cost less. Of course, since the guardian is being released for next season you'd have to buy it new, as opposed to being able to find used deals on the mfd/alpine binding setup. I'm not sure what I'm trying to say here, but in terms of price, used mfd setup<guardian<new mfd setup. Of course you could just accept the stack height and get a duke. Or if you're only doing super duper short hikes you could just get a set of trekkers, although those things are known to break down at the worst of times. Although if you're seriously looking into touring and willing to spend the money, you could get a set of dynafit vertical ft12s or plum guides, although then you have to get a compatible boot. Basically, you just need to make a decision about the level of resort and the level of touring you want this ski for.
Lots and lots of touring, a small bit of resort=dynafit/plum/g3 onyx/la sportiva, etc.
50/50 touring and resort=guardians/dukes/mfd setup
Lots and lots of resort, a small bit of touring=trekkers (god forbid)
Good luck, I'm sure you'll have a shitload of fun either way.
BTW, jefferies look fucking sick. With any luck, I'll be on a pair of 191 caylors this year so I'll get a chance to experience the quality everyone's raving about.