Speaker and amp advice needed

Thanks in advance for any advice.  Love great sound, but far from an expert.  Current set up is in an 18x21 foot room.  The ceiling is 8 feet tall.  I sit toward the back of the 18.  It is set up that way because of a beam that runs along the ceiling and only way the home theater will work.  I have Sonus Faber Olympica bookshelf speakers than I use with an Anthem amp that runs the home theater, and a roon and Moon streaming device.  The rest of the room is Sonus Faber as well, and I also have a Sonus Faber sub.  I would like to upgrade the two channel sound.

Was wondering a couple of things:

Is the room, especially the ceiling height too small for a large speaker like a Sonus Faber Amati Tradition (which I would get used)?  Or, would I be better going with better bookshelfs, such as the Guerneri, or the Focal Utopia, or something like that?  Also, was thinking about getting a Mcintosh amp, such as the MA352 since I like warm sound.  

Thanks for reading, and any thoughts would be helpful.  I tend to drive myself crazy overthinking things and never get anything accomplished because I over analyze.  I listen to mostly vocals, and really love female vocals.  But, also enjoy most other music other than rap and heavy metal (which I don't listen to in the listening room).

Thanks

Jonathan