The bueaty of the line arrays is the clarity and dispersion you get. I've used combinations of (1) JBL EON One ( just did a brunch at a CC ) , two for larger rooms and STEREO !, and just last week used two with my small Behringer sub for a DJ dance party in a bowling alley where I had to do a bunch of Hip Hop.
My keyboard never sounded better and singing is so much easier with the clarity and coverage. No monitor needed.
I will never go back to speaker "Boxes" again.
Get two JBL Eon Ones, and enjoy. Your back will like them too. You will be very surprized by the sound quality over conventional speakers and Yes, you can always send them back but I bet you won't.