I ride both the KLR and the DRZ. I honestly couldn't recommend either as a first dirt bike because of the weight, although the DRZ is significantly lighter than the KLR. If I had to choose between the two, I'd recommend the DRZ with a low seat.
A female friend and inmate here who's about your size started riding an XT225 that we picked up used this summer. She's an experienced road rider.
Now, wait a minute. It's no fire-breathing monster. Far from it. However, what it does with it's horsepower is pretty amazing. I've ridden it, although at my size, I look like a trained bear on it.
The XT has a really nice transmission. It has the lowest first gear in the industry, and a sixth gear that rips pretty well on the highway. It's light, non-complicated, and relatively cheap. It gets about 72 mpg.
It would be my choice as a great learner bike, and one that you'd likely keep even when you stepped up. There's nothing wrong with cheap, light, and friendly.
Canuman screwed with this post 02-24-2013 at 10:19 AM