What type of randonee binding should I get?

There's a GREAT thread over on TGR right now comparing the Duke, FR+, and NX21.  You can find it here:  http://tetongravity.com/forums/showthread.php?t=111768

For what it's worth, I wouldn't recommend the Duke unless you're doing a lot of resort and sidecountry on these skis.  I've seen a lot of people around here dying on the climbs because of that tiny thing Marker calls a climbing bar on them.  It just doesn't get your heel high enough to weight your skis right on the steep stuff.  I'd call the Dukes an alpine binding with a touring option;  they're definitely a comprimise.  Good binding, but not for everyone.

I'd also pick the NX21's over the FR+ (already did, actually).  They tour better, are more torsionally stiff, and are a bit lower.  I did a review of them here: https://newschoolers.com/web/content/reviews/action/read/id/548/

but think do you want a bindings that rips going down or is east as hell to tour? decide first

we all know y we tour its to ski down so i would get a bindings that is rock solid coming down and defintly demo them. or just learn to tele then its even easier