If your route has any amount of off tarmac in it you would probably be better with a single rather than the multi's. I have no experience of the tenere but by all accounts it is a very capable travel bike and this is the bike I would choose from your list.
Another option would be a bmw Xchallenge. While it doesn't have the same tank range as the tenere as standard, the money you would save on purchase price would allow you to but either an Xtank or the Touratech auxiliary tank and give you cash left over for your trip. You also get a bike with better suspension and fuel economy.
I do like the Enfield idea though.
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