the 9's leg room
Jason,
I'm 6'2" and fly a 9A. On longer flights I like to take more than my share of available space and will put my right leg over near the far right rudder pedal on my wifes side for a couple minutes now and then. This and 3 hour flight legs does it for me. Typically I can get my right leg straight by placing it between the rudder pedals and to the firewall. This is the default position while flying cross country for me. The left leg is the problem! There is simply no straightening it unless I physically turn my hips a little and angle towards the passenger rudder pedals with both legs for a few minutes. This is more doable if you are alone. Most importantly for you will be to get the best seats that you can. Don't go cheap and skip on the comfor foam or you'll be in misery on long flights with your size. Secondly, If your significant other is a large person also you might not be comfortable on trips. I've had friends in my plane that are at least my size and woundn't even condider a long trip with them in there. For local flights up to an hour or so it would be doable. Another thing that I did was to have the seats made so that mine is thinner than my wifes. This gives more headroom and legroom. Lastly, I'm finding that I don't get uncomfortable until late into the 2nd leg of the day, or after an hour and a half or so into the 3rd leg of the day. Oh yeah, lastly again, cold makes it almost unbearable once your starting to get achy! Seal your plane well and depending on where you live go with possibly two heater muffs. Remember, this is for 8 or 9 hour days in the plane. A single 3 1/2 hour leg is no big deal.
Good luck in your decision,