I've been using a 2000W FRFR monitor for my guitar onstage in the backline. This allows people in the audience who are close to the stage to hear the guitar since the mains are usually over them. I gotta say, I really like it. For a smaller venue I can play sans reinforcement and just use it the same as an amp cabinet. It also has dual inputs so the stereo ping-pongs aren't lost. At 2000W it really drills through the mix. The one I'm using is also a composite cab so it takes rain and snow well and only weighs about 30 pounds. Sound is consistent night-to-night and venue to venue too.
When I think of how we used to struggle in the old days with mic'ed amps and guitar monitors I sometimes wonder how we did it, lol. Pretty neat, you may want to consider one.
Chuck