I'm a big fan of the Cyclone GT, but I'm just running a 13-30 cassette..
The SunTour VGT is going to shift just as well, weigh a bit more, and be more robust.
The Shimano Crane is pretty sexy too, and likely works great.
The Huret Duopar has French charm, but a weird way to attach to the dropout and a potentially fragile 2nd parallelogram. Might be the derailleur for you if you like living dangerously!
The Campagnolo Rally might be fine, but when you think touring, you don't think "Campagnolo". Never made any sense to me.
Steve in Peoria, with a distinct Japanese bias when it comes to touring gear.