The 400 weighs a lot less than a 650. You may like that. It has been brought to my attention that the SM model also has a fan on one the radiators, which the regular DR-Z does not, which may suit what you are doing. I know the SM is better on the road than the regular DR-Z, and I would guess that it is superior to the DR650. But I would also think the DR650 would be a better longer distance bike as the DR-Z's seat is a bit planky. Also the DR-Z is quite high off the ground, but if you are limber and don't have some silly need to be able to get both feet on the ground at the same time you won't care.
Buying new 17" wheels and futzing with the brakes to convert a regular DR-Z is quite expensive.
I am putting some softish dual purpose 17" tyres on my DR-Z shortly, I may be able to report after the weekend how that went. Personally I think street tyres are just fine off tarmac as long as it is dry.
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