Tires for a TW200 are expensive and difficult to find. And are not something you'll come across without ordering in advance, even at a Yamaha dealership.
Test rode a WR250 a few years ago (bike hasn't changed much since then). It retailed for over $7000. Fuel injected, keeps up on the highway, crosswinds will blow you everywhere. Decent FE. A little light to load up with bags and ride from state to state to state.
Also test rode a CBR1000RR.... that was fun.... they said it would do 165km/h in first gear, I got it to 140km/h (in first)... I'd own one if I though for a moment that I wouldn't hoon myself to death.
Still... KLR's make for a good long distance ride!
