It will be interesting if you find even one person that has ridden all those with a passenger.Planning our honey moon in Costa Rica and I'm considering renting a bike for us for a week instead of a car as I heard the roads can be pretty rough and more suited to a bike, not to mention it could be fun
So far the options I found are:
KTM 640 LC4
BWM 650 GS
Aprilia Pegaso 650 Trail
All the same $540 / week price (though I haven't really price shopped yet)
Anyway from looking at them I'm guessing I'd want either the BMW or the Aprilia but since I'm the motorcycle nut and she is less so I'd like to opt for the one that's gonna be most comfortable for the passenger.