What you want to do with it will dictate what you should buy. Do you want an Adventure/tourer like the GS1200, Super Tenere, KTM 1290. Do you want a light off road like a VStrom or a more dirt worthy bike like the XR650L, DR650, KLR650?
I own a VStrom 650 and can tell you it is a pig in the dirt. A very skillful rider would of course be able to make it do tricks, but for the average weekend explorer it is too heavy for anything but improved dirt and forest service roads.
However, I do like the Suzuki's and the
DR650 gets my vote for a dirt-worthy, easy to handle, cheap to maintain, reliable as a rock, infinitely customizable dual sport. Back in July 2010 two buddies and I rode most of the Continental Divide Trail. It was an epic trip.
The rider from Florida trucked his bike out and met us in New Mexico. My other buddy and I left Alabama on July 5, took US 82 to near Amarillo, TX, angled southwest across Texas and New Mexico, got on I-10 near Alamogordo, and then crossed the desert to get to Silver City, NM, where we got on the trail.
Three weeks later we got off the trail up on the northeast side of Yellowstone.
Below is one from the trip out. I'll dig up a few more and post via edit.
We had the knobbies installed at a shop in Silver City. Here is another taken on July 10.
Even grossly overloaded the DR650 performed flawlessly. The only problem I had was after taking on a tank of rotten fuel. After that was flushed out of the system the bike was back to normal.
We rode just at 5,500 miles round trip. I had installed a Sargent low-seat that took the pain out of the long days in the saddle.