I'm 6'3" and 300# after a diet. I ride a 2004 XB-12S and am comfortable on it, particularly around town. I also ride a Suzuki Bandit 1200S and a Suzuki DR650. The Bandit has a similar riding position and the DR is spread out. I do look like a gorilla trying to hump a football, but I truly don't have anything to give. I'm all out of F@#K's or S*&t's, and I haven't even back ordered them.
With that said, if I had the option, I would look into the longer framed bike if possible. I'd also buy the newest one possible, but condition trumps age. I'd love to have an STT model, as I love the way the look. But I'll roll with what I got. A clean, well kept bike is what you are looking for. Also consider spending a tad more to get exactly what you wanted.
When I bought mine (2004 XB-12S), It was listed for $3000 back in 2014. I was able to trade about some firearms (which I has $1200 into) and $1200 cash for it. So it was a no brainer for me. But there was a 2008 XB-12STT for $3500 that I passed on as it would be all cash out of pocket. In hind sight, I should have bought the STT and sold my firearms to make up the difference. I thought the XB would be a short term fling and I would sell it in a year or two, so I wanted the one that made the most money sense. Now I love my Buell and have kept it as long as any other bike I have ever had.
The bike has been as reliable as anything else I have owned. It has required less maintenance than most. No valve lash clearance to check and no chain to adjust every so often. Just change the oil and inspect the bike.
Before the Buell, it has always been Japanese bikes (Honda VFR & CBR1100xx, Yamaha FZ-1, etc). So I'm used to reliability and easy maintenance. When I bought my Buell it was cheap, but abused (had been low sided on both sides). So once I got that fixed up (replaced swing arm), it has been reliable ever since. I did replace the fuel pump (although a rebuild would have done it) at 35,000 miles, a head light 'S' shaped mounting bracket ($12 part that cost $15 to ship), a rear brake switch, and fixed a pinched headlight wire. Very minor things that I have done on bikes in the past. In fact, I have spent less time on repair & maintenance than on any bike before.