I am in your exact situation weight and height wise. Your not gonna find a good bike that will answer the short inseam problem. Lowering kits also effect the bikes handling and suspension. I have learned to put up with the bikes being tall. An E-start will go a long ways in helping you out specially when you find yourself holding the big XR up where its not so easy to kick it. I put a Baja Designs
E-start on my XR650R and an Edelbrock
carb which dealt with the hard starting issue after dumping it. It now starts 1st or 2nd kick after dumping and many times it simply does not die. Edelbrock
is a good investment. I road the big XR for many years in the tight stuff and did just fine. The right tires will help you out. I found that a trials tire up front helps reduce the wash. Trials tire in the rear is great in the slow stuff but the trials tires cannot handle the abuse of the big XRs torque combined with speed on fire roads. I also installed an autoclutch which makes you feel like your cheating when riding the big XR in the woods. It makes everything easy.
This last summer I purchased a 05 KDX220 and boy did that bike surprise me. It is awesome in the tight stuff and it handles my weight just fine. Pretty inexpensive too.
But you might consider the KTM 200 or 300exc or several of the Motocross 250s would make good woods bikes (yz250 or KX250 or RM250).
If your set on another four stroke the 510 mentioned in a previous response are awesome bikes once they are set up right. And the fact that they are dual sportable makes them even more attractive.
I also own a 525exc which I feel is an awesome woods bike when you want to move a little faster in the tight stuff and it is a very desert worthy bike too.
At one time or another I have ridden all these bikes and find them all capable.