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Good choice not to go pre 70's then.
There are so many bikes that can cover that kind of use. Honda VFR would seem like a good place to look.
You are looking more at off road types though. Not usually the choice for continental trips, too upright and not enough wind protection.
Having said that you should ride whatever you want. I did a lot of mileage on a 400 without too much trouble. Once you get started you'll probably want to try a few different bikes.
All year round but for pleasure, I've got some family interested in doing trips down to France and Italy. I also want to do a solo trip next year exploring Scotland, I'm quite embarrassed by my lack of time back in Scotland so why not combine it with motorcycles. On the weekends its most likely the local lanes and salisbury plains for me.