I bought a 650 (KLR) as a first bike. I am 6ft 5in and about 200lbs. After going through the motorcycle safety course (required for class M license in TX) where all you ride are 250s...I am VERY GLAD I didn't get a small bike first and bought a 650 right out of the gate. I would have hated wasting my money on a bike I couldnt fit on.
I dont know much about the BMW bikes...but are pretty though.
Free bump!