It's not a kawi, but suzuki makes a decent dualsport in the 400. I think it is a DRZ-400. Uses the same engine that's in the 400 quad. Puts out about 30 hp, enough to get you where you want to go but not get you into trouble too fast. I'm a bigger guy and trail ride also. I ride a KTM 300exc. It is a two stroke but pulls like a four stroke. It's not street legal but it does have a headlight, taillight, and kickstand. You can pick up a used one of those in good condition for $1500-$2500. Also, some of the newer four strokes come in a trail version with lights and wide ratio transmissions, but they are alittle more pricey.
If you are new to dirt bikes and are riding trails/mountians, I would get something used with alittle more power. Put some good tires on it and put a Rekluse auto clutch in it and ride like a champ.
Oh yeah, if you can find one for sale, the Honda XR400 was a good bike. That engine was about bulletproof.
green 10r, Akro EVO 2, Hyperpro rsc, tre, pcIII, Puig DB, K&N, Purvision HIDs, Speedohealer, GONE
08 Ducati Hypermotard S
08 Kawi Concours 14, Area P full sys, PCV, Flies out