Don't get a lowrider, I'm 5'11" and had to get rid of my lowrider due to my balls getting mashed into the seat. Get the bigboy. BTW, my wife is 5'4" and could look over my should on all of the seats I've used over the years.
I've found that seats are an individual thing. I'm also 5'11" (30" inseam) and I like my Lowboy much better than the Bigboy I had on my IS. It's nice to sit a little lower and it's also better on my back, maybe because it's firmer? No trouble with the "boys", of course the wife keeps them in a jar on the mantle most of the time
