If you plan to ride a lot of offroad, and just use a licensed bike to get to the trails get the kawi klx bikes or Honda XR650L....if you plan to ride a mix of pavement, fireroads, and some trails try the Kawi KLR650....the new 2008 KLR is a good riding bike, but rather heavy for hard-core offroad battle....oh and the stock tires are junk.
my centerstand equipped KLR 650(and misc bits like barkbusters) fully wet tips, er,, crushes the scales @ 426 lbs., (but feelsmore like 410lbs. on the trail, yuk yuk), my 03 KLX 400 (legalized dirt model), which is absolutly the same as a DRZ 400 dirt modelweighs in at a much more reasonablefully wet 300lbs.
I recently moved up from a yammy xt 350 to a 05 klr 650. I was hesitent about the weight and seat heigth of the KLR. Neither one turned out to be an issue. I use it for just about all kinds of riding and find it to be an awesone all round bike. One buddy (drz 400 rider)used it for about 100km one day and now calls it the "big comfy couch". He said that he felt it was way more comfortable than the DRZ on the HWY. He said that he couldn't see himself riding the drz over the Coquahalla(yeah I know I cant spell). He felt that the drz was likely a better off road bike and Idon't doubt that he is probablyright.According to him the drz is quite a bit more nible and has better throttle response. The klr more torque. A couple of weeks ago a different buddy and I did about 2300km on an Island /Sunshine Coast trip. My buddy was on a CX 650 street bike. I easily kept up to him while passing other traffic. His backside was a lot more tender after a long day in the seat than mine was. The only little issue I had was that the speedo seems to be inaccurate. when it read 120 km, my gps consistently said I was going 112km. Not a big deal unless your trying to avoid a ticket. Another consideration is the fuel capacity, DRZ 12 liters(I think) KLR 23 Liters. That also needs to be factored in when looking at wet weights(what does 10L weight?? maybe 15-20 lbs??)and distance between fill ups.
I beleive both bikes to be worthy of consideration, just depends on where your gonna ride. More dirt/single track= DRZ, More logging roads and street/ hwy = KLR, either one = tons of fun!!