Since you're looking and asking about gasser bunkhouse motorhomes, you may want to also consider TIffin's Allegro 35QBA, as well as Winnebago or Itasca's bunkhouse model (can't remember the model number). There's probably a few others as well, but I can't remember them.
As far as noise goes: Like you said, can't really believe the reviews. Best thing to do is take each unit for a test drive, and decide for yourself which one(s) are quiet enough for your liking.
..Only one other very minor point, I'd like to clarify:
...all have similar wheelbases (208).
Even though all the documentation states that the Georgetown 351DS has a 208" wheelbase, as one that owns one and physically measured it, I'm here to tell you its actually a 228" wheelbase. I think Forest River got their documentation mixed up some time ago and just didn't update it. Not sure about the others, but I know for a fact our Georgetown 351DS has a 228" wheelbase.