Hi,
New to the forum but wanted to forward my recent experience with something similar. My room is 14x26 and a bit irregular... plus 10 ft cielings. I just went from bookshelves + sub to floorstanders and both were really good. I would say for music the floorstanders' is 99% as good as the 2+1 (better actually in some ways as it's quicker) and 95% as good for movies. The walls rattle a bit, but the whole house doesn't shake.
BTW, regarding not being able to get below 50hz in a small room... I ran my bookshelves that go down to 50hz 3db without a sub and then with... and it's a VERY noticeable difference in music and movies but I only ran the sub for movies as it was a bit muddy. So while you may not get 20hz I don't recommend doing without the low end even in a smallish room as you do get something (maybe someone can chime in as to what?). Then again I'm new here. Multiple grains of salt needed.
Have fun