I am in a six piece Rock, Blues and Country band with 3 guitars, one keyboard, bass, large drum kit, and 5 vocals mics.
We are using a 16 channel Mackie board, three 1,000 watt power amps, 2 Community 4x15's, 2 Community 4x12+horns, and 4-6 monitors of various kinds.
The Community cabs are for the FOH mains. For most of the smaller venues, I don't use the bass bins (4x15) and don't need the third power amp. When we use the full system, it's just too loud, and frankly I'm getting tired of moving them around.
For the monitors, we usually have 2 Carvin 15" wedges up front for vocals. Another wedge goes back behind the drummer and teh 4th will usually go over on stage right for the lead guitar to hear vocals. We will add monitors on stage Left for me (bass) and the keyboards to hear the lead guitar, only when needed. All of the monitors will run off of one of the power amps. We run 2 mixes, one for the vocalists up front and one for everyone else off the other channel.
I run 31 band eq's on both monitor channels and a stereo eq with about half the the number of sliders (don't know how many) for the mains. We usually have more feedback issues on the monitors, very few issues with the mains.
I have been using this basic system for about 20 years, running sound and playing bass. Over time I got really frustrated trying to do both and got a guy to cover the board once we start playing.
I vastly prefer to do shows with a house system. I am really tired of tearing down, moving and setting up. We have a trailer to haul it all and are very efficient at packing and moving.
The system is only used for gigs where we have to provided our own sound, except for rehearsals. The thing is we don't make any extra money at these gigs and all the work is barely worth it. We figure in about 3 hours to tear down and set up, each time the system is moved. This gets a lot shorter with more help. I do it only because there is no other way to make the gig happen at times.
Currently I want to replace my board with a PreSonus digital, but a 2K for a 16 channel, I'm holding off for a while.