The father of a girl I dated in high school is in his 80's and owns a KTM 390 and a BMW 1200. I visited in July when I was in town and he took me to some awesome twisty roads near Kingston Ontario. He goes back to racing bikes in the 60's and I had to really work my 865 Bonneville to keep up with him on his KTM. He mostly only uses the BMW when his wife wants to come too.with regard to all of this discussion. the 650 vs the 1000... i say either are just as good or no good off road....IMHO. That said, money no object... the 1000 for street and light duty non street... and a sweet KTM 390 & a camper to take to your off-road place etc.
If your riding preference is not to gnarly, the Suzuki 400 cc thumper is a great choice.