Like Herb said, the KLR is big, heavy, but will be alot more comfortable on road. I think the XT is a bit small for your size and weight. Too slow on road and maybe a bit underpowered for your size off road. I wouldn't recommend a new KLR to learn off road, even easy fire roads or double track. The plastics wouldn't last long.... Herb may have hit the nail on the head. The DR is physically Smalley and more manageable for learning but will still be capable on the road.
"Where ever you are, there you go..."