I have a 30" inseam. The 35" seat height and the 300 lb. weight of my KLX works well. I'm slow, hate broken bones, don't go beyond what I think I can handle. UlyBrad's MSR dirt course is the way to go. but get good dirt gear. It'll be be handy when you fall.
I second the KLX 250s if you can find one. Street Legal, reasonably light, electric start, reliable, can do highway (not that you would want to, 80 mph with it's neck wrung out but definitely not comfortable like a big bike), cheaper than a WR250R, lighter than a CRF250L.
You can take it all the way dirtbike like I did, or leave it street oriented. This got me through my offroad learning period with little effort. They sell really fast if/when you decide to upgrade and I got almost all of my money back out of it. Mine was sold within 24 hours and they drove from Austin to Houston to buy it. I had another solid offer from someone else in Austin right after that. Riding something like this will tell you if you are interested in large bikes or small bikes and whether or not you are really interested in offroad. I thought I wanted a DR650, turns out I just wanted a big dirt bike to ride single track. Edit: Also realized I did not want to deal with a kick start from dropping the bike or restarting after a break. I'm lazy and kickstarting on the side of a hill is nigh on impossible.
Trust me, you want a light bike if you think you are going to try any trail riding. AND you should learn trail riding on a light bike before riding a heavy bike. You learn so much about balance and riding on single track and much more quickly. It gives you much more confidence on the big bikes where small mistakes can mean a big dump.
Is it feasible to convert a non-road legal dirtbike so it can be plated?
This is where I went after the KLX. I wanted more power, I first tried a KDX200, realized that 2 strokes aren't for me. Ended up with a 2007 WR450F. More power than I'll ever need and a much better dirt bike than the KLX (Not that the KLX was bad).
Very few things are required to convert an offroad bike to street title in Texas. It was very straight forward with the WR since they are street legal in other countries. I ordered some OEM style connectors and made my own plug and play DS harness. It took me about a month doing a little bit each weekend because I was too busy riding the bike in between.
www.txdps.state.tx.us said:
What's Inspected by Vehicle Type
Items of Inspection for a Motorcycle and Motor-Driven Cycle
05.07 Inspect Every Motorcycle and Motor-Driven Cycle For: (listed in suggested order of inspection)
* Check for evidence of Financial Responsibility
1. Horn
2. Mirror
3. Steering
4. Brakes (system)
5. Tires
6. Wheel Assembly
7. Exhaust System
8. Tail Lamp (1)
9. Stop Lamp (1)
10. License Plate Lamp
11. Rear Red Reflector (1)
12. Head Lamp (1)
13. Motor, Serial, or Vehicle Identification Number
Definitions:
Motorcycle: Every motor vehicle having a saddle for the use of the rider and designed to propel itself with not more than three wheels in contact with the ground but excluding a tractor.
Motor-Driven Cycle: Every motorcycle with a motor which has an engine piston displacement of not more than 125cc.
NOTE that you must have a title to convert to street legal. If they don't have that, I would pass since the bond process is complicated and time consuming.