The KLR has incredible aftermarket support and product availability. And good re-sale. Also known as the Jeep Wrangler of the off road crowd.
All the DR series are quite good in this regard as well, lots of 350's around as it's now a 400 if new....but the Yamaha's are not anywhere near as well supported. Just look at their existing new current crop of Yamaha dual sports...quite uninspiring.
Anything you get will be a compromise, as tire choices and weight are the 2 biggest drawbacks, for the off road part of "dual".
You will be impressed, however, with the road handling abilities, even with a fairly aggressive knobby tire. The wide handlebars will put new meaning into the phrase "countersteering".
You're going to slide it and dump it, so don't go too pretty until you learn how to ride off road, and particularly, how to stand up on the pegs and ride. Skid plate and hand protectors are a must.
Great choice of a bike type though...off road/dual sport/highway/byway.....too much fun, and who cares if it rains!
Why not go to
www.advrider.com and look at their adventure bike section for some direction. Here's a snippet of a few short reviews...maybe not in your range, but you get the idea:
Kawasaki KLR650
Light, durable, immensely off-road capable, yet it can cruise all day at 75 mph in surprising comfort. The Jeep Wrangler of dual-sports, its fanatical users believe it's the best adventure tourer. Solid and reliable water-cooled engine.
Cons: We're not talkin' style here... But it's charming in a Hummer sort of way. Not much room for a passenger. Lame front brake (but there's a kit to improve it), alternator has just enough juice for heated grips and a vest--maybe--but nothing more. Everything vibrates off without Locktite.
BMW 650 Dakar
If you like BMWs but want something lighter and more off-road capable than the 1150GS-like urban assault vehicles, the Dakar can make it happen with good looks, good add-ons, and goodies like heated grips and ABS, with an alternator big enough to power electric clothing.
Cons: Not quite as off-road capable as the KTMs nor as light and inexpensive as the Kawasaki KLR or Suzuki DR. Some owners complain of lingering surging issues around 3500 RPM.
Suzuki DR650
The only air-cooled single on this list, making it the lightest, and simplest to maintain.
It's affordable, reliable, fun, and has enough aftermarket parts--including windscreens, center stands, larger gas tanks, and racks--to satisfy most people.
Cons: Neither a work of art nor a status symbol. The seat is not particularly comfortable and the standard tank is only 3.2 gallons
(if you're rich) KTM Adventure R
The bike for dirt lovers who are willing to trade off miles traveled in a day for the best off-road talents of any adventure tourer. It's light despite an impressive 7.4-gallon tank,has incredible suspension and brakes, and exotic good looks.
Cons: Cinder block of a seat, extraordinary height, dirt suspension and limited wind protection make most owners wish for more comfort on the freeway at 75 mph. Vibration drives some owners wild; others say no problem. Expensive maintenance and hard-to-find parts.
By the way,
I have the non Dakar version of the BMW, and with my trials background, and knowing how and when to weight and unweight the bike, I can take it to some pretty scary spots, but it's a pig to turn around in a tight spot, and heavy if I should ever dump it...haven't yet, at least not off road..

The extra weight is nice on pavement however....this thing handles the twisties like you would not believe.....a definite sport bike destroyer!!!