It really depends on what you want to do and how quickly you can pick up riding.
That Husky TE610 the ultimate dual sport IMO and a lot of bike for a new rider. Honestly, I would look at a DRZ for a starter bike. It's smaller in size, not as much power, but still more than enough power to do anything you ask. The Husky would be a good bike, after you have had some time on something in the 400/450cc range.
As far as price is concerned, that Husky is fairly expensive for a used dual sport. Well worth the money, but since you'd be new to riding, you may be better off getting a cheaper, smaller bike and breaking your way into riding on that and spending the saved money of outfitting the bike, riding gear, etc.
My DR650 is a 2008 and probably worth $3500-4000 at the most. Like a Jeep, it's hard to get money out of aftermarket parts. I wouldn't pay for them and didn't.
I bet you can find a DRZ that is street legal for $2000-3000, which is quite a price break compared to the Husky.