What is the best loudspeaker for a small room?

I have a very small audio room, 16 ft (L) X 14ft (W) X 8 ft (H). What are my options if I want a floor standing loudspeakers? Of course price is an issue but maybe I can equate the price later on based on the performance of the speaker. I enjoy listening to almost all types of music using pass labs pre xp20 and power xa100.5 amps.