A used DS will probably come with things like a skid plate, radiator guards, and some sort of Barkbuster already installed.
And most of the bikes you listed are pretty bullet proof.
Since you will drop it, not when, Barkbusters can save big money that you might otherwise spend on new levers and perches or bars.
I bought a new KLX250S(still carbed in 2013, btw) and added all that stuff to go off-roading. It wasn't cheap. But I got exactly what I wanted.
The bike needs protection, just like you do. The bike and I have augered in more than a few times and neither of us has sustained any serious (ride ending) damage.
The Fly Trekker is a nice DS helmet for around $130, comes in Hi-Viz too.
Good luck with the search.
And I understand about wanting it now, but deals come up here, deals worth waiting for....just saying.