Most people here in the replies have been talking about large displacement dual sports. If you are a large and heavy person, a small displacement dual sport may not be your best choice. I ride in tight woods, rarely able to get into third gear. I have large friends who ride 650s in the woods, and they get pretty tired muscling all that weight around. I am short and fairly light, and found my XT350 a little too tall and a little heavy for tight woods work. I still needed a bike with a plate to get to the woods. I got tired of picking 300 pounds off me and kicking and kicking to get it started again after wiping out. The solution? I bought an XT225. I performed a few tweaks including dropping the countershaft sprocket a tooth, different carb and pipe and sreet legal knobbies (Pirelli MT21).
The end result is more fun in the woods and my lap times on our little motocross track in the woods are faster. With the "magic button" starting is a new experience; particularly on a steep rocky hill where you can't kick it and stay up. On the street of course the 225 doesn't have the top end charge of the 350, but the torque and low end of the bike is impressive. Two guys I ride with have DRZ400 and an older XR650L.
We were on the highway and I decided to see what the 225 would do. I saw an "indicated" 82 mph, and both guys on the larger bikes behind me saw over 80 as well. They said if they hadn't seen it for themselves, they never would have believed the bike could have done that. The bike was modified as mentioned, but this was before the knobbies were put on. Its quite clear the rolling resistance of the knobbies has knocked a few miles per hour off the top end.
Frankly my ego doesn't require that I ride a large motorcycle in the woods. I've seen too many people buy a large dual sport and are then too afraid to do some real off road riding with it. And if they do try it, it was too much work and/or too nerveracking. You're going to fall from time to time in the woods, and with good gear and a light bike it's no big deal. It's all about having fun. I started dirt riding 35 years ago, and at 48 I still enjoy it. Just my 2 cents.