I don't want to rain on your parade (of bikes) but I'd be amazed if the DR200 (or any of the others) will cruise at 70mph. With 15bhp or thereabouts you might just about touch that on a good day flat on the tank but that's a far cry from cruising at 70. Adding luggage will knock some speed off as well. Laden, somewhere between 55 and 60mph would be around what I'd expect it to be comfortable at.
I freely admit I've not ridden any of them so my opinion is probably worthless but I've had / have enough bikes with similar specs to have some sort of feel for what 15bhp will do
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