Looking for speakers in a large vaulted great room

I have a large great room that we are building that will have the dining room in between the great room and the kitchen.  The 2 rooms combined will be about 21’ wide by 30’ long to the edge of the kitchen.  The room is vaulted, and will have a wall of glass, sliding glass doors and windows on one side leading to the outside.  Needless to say this is not an ideal listening room, but I would like to have some speakers that fill the space with music.  I am not trying to do surround sound, just 2 channel from one end, opposite the kitchen.  There will be a fireplace at that end, and I could do floor speakers or bookshelf, although there will be a window on either side of the fireplace, so the bookshelf speaker would have to sit on top of a built in-cabinet below the windows.  Not looking to add anything to the walls, trying to make the room an enjoyable space with great sounding music.  Willing to look at used speakers as well. Any thoughts?