Your room is going to provide a good deal of room gain. Even small loudspeakers will probably sound like they are providing deep bass. The room will actually help you in this regard. But boundary conditions will create some standing wave phenomenon, no matter what loudspeaker you chose.

If it were me, I'd probably go with two π towers. I have a pair in a room very much like yours, and I have each placed at opposite ends of one wall about a foot and a half from the corners and about 4" away from the wall.

But I've also put seven π cornerhorns in rooms this size and they sounded very good. You can listen to them nicely from just a few feet back, and in spite of the room's size and the issues that causes, the sound is very good. I have a pair in a room that size right now, with one corner completely wrong. I just don't have another place to put them. They still sound glorious.