what your saying makes sense. that te would cover all your offroad and overlaps your dakar quite a bit. it looks like your a thrill seaker too which means the versys is your kind of street bike with a little offroad ability. I rode a gs 650 a year ago and felt the versys was only a little worse of a dirt bike,, mostly because of suspension and weight of the gs.. that wasn't a dakar though! i'm sure the dakar with a 21 front wheel would be a much better dirt bike than a versys. you can putter around offroad with the versys but nothing serious. for the same weight the dakar isn't in the same league as the versys for power, even lugging the versys will be much more fun.
If you wanted a real purpose adventure or open road bike the versys may not be a good choice, its not a great 2 up bike either but ok if those rides aren't too long. Good luck!