The system I used for years was a Mackie 808s powered mixer, JBL SF-15 mains, Carvin 12 passive wedges and a Carvin stereo power amp. The JBLs sounded great, but the cabs were MDF and each weighed around sixty lbs. Recently, around the same time as the Carvin amp blew up (literally - sparks, flash flame, smoke, the whole enchilada), I played in a jam with IEMs. It inspired me to upgrade the PA. The first thing to go were the 60 lb. JBLs. I'd done a few gigs where the sound guy mixed from the iPad. I researched and decided to go with the Mackie digital mixer/iPad set up. Switching to powered mains was the obvious choice to match with the Mackie, which led me to the Yamahas. Since I already had four passive floor wedges, it made more sense to pick up the Behringer four channel power amp than to go with powered monitors. Especially as I hope to transition to IEMs. If I were starting from scratch, I'd think seriously about powered monitors, though another consideration is that they need to be plugged in - more wires underfoot. Make,sure to get yourself a big roll of gaffers tape, it's great stuff!
Bill, tgo