I’m 6’ and 270. I’m not “narrow” by any definition of the word. I get in and out of my Ovation with no issues whatsoever. That said, I have developed a unique “fat man roll” technique to ingress and egress that involves sort of rolling over the right seat on the way. Whatever works! My Ovation is supremely comfortable when I’m in. Love it!
Meantime, I’ll chime in on the Turbo discussion (as I don’t own one and therefore I’m uniquely qualified to know everything). I love my Ovation because it gives me”turbo like” performance. Especially with the 310HP STC in place. For 90% of my flying I wouldn’t want anything else. However, I take the long way to Denver (HND - APA) via the southern route because I’m not flying over the Rockies , which I am loathe to do regardless. I climb well up to about 18k and get good TAS in the 172-175 KTAS range on 11 GPH or so at that altitude. So, it works well for my mission, but it’s NOT a turbo. If my mission has me routinely departing high DA or routinely flying over large, high mountain ranges, a turbo would be great.
For my usual mission of HND to CXO, HND to EUG etc I’m fine with NA. Yes, it would be nice to cruise at 20k with a big tailwind and have the option of 65-70% power but the issue is that when I come back the other way, headwinds will prevail and I’ll want to cruise lower and at the lower altitudes, my O3 shines. So, like everything, a trade off.
That said, my next bird will likely be a turbo - either an Encore or Acclaim S. As for the extra costs for a turbo, yes, its an engine with more bits and pieces so it will be nominally more expensive but labor is the single largest maintenance cost regardless and that hourly rate is the same regardless of Turbo or NA.
If you think your mission would be better completed with a turbo, get one! You won’t regret it. Generally, people who buy NA and find out its not quite the right choice will wish for a turbo, but people who by turbos and find out they probably didn't need one are unlikely to wish for a NA.
Regardless, you’ll love whatever Mooney you choose! IMO Acclaim S and Encore are 2 of the best GA birds out there (along with O, of course!).