Riding 600cc and smaller around the world

[Lowrider1263]

I've read so many stories how riders decide on what size bike they need to do that big adventure, it's down to choice, where you intend to go, I keep reading I will need to site on a motorway for my first stretch so I'll need a decent size engine but then when I get there I need it to go off road.
Decisions are based on the first leg, I've used a big trailie like a bmw 1150 gs to do some fantastic trips, I did a tour last your halve way though my trip I did a 36 hour enduro on the big trailie then continued touring, hard work but that's the way I wanted to do it,
What I've found traveling on big bikes each leg of the journey becomes a way of getting a to b
Using a 600 seems to put me in a different frame of mind, it's not a case of when I get there, how, I don't want to travel on highways to much, I'm looking for picture post card routes, when the road runs out I'm glad I decided to take my 600.