I'm one of 3 singers in my band. We do a sort of pop retrospective thing from 60's to current. Maybe we're a variety band... Tough to pigeon hole us.. Anyway, most of our work indoors is pretty low volume. Our guitarist plays a Martin or Taylor acoustic 80%, an electric through a Rivera 25 watt 1x12 mic'ed or not the rest of the time. His acoustic is in the pa via a Baggs Para DI.
I use a custom built 1x10 combo and extension cab stacked. The extension cab is as much to lift the combo cab as anything... GK mb2-500 head is built in. Love that little rig and give it a ton of work. I am in the PA using the DI in my BassBone, Zoom B3 in the effects loop, Pitch Black in the tuner out. I generally carry 2 basses and gain balance with the BB...
A Nord Stage piano II, 73 key direct in completes us electronically. Drums are acoustic and only mic'd if necessary..
PA wise we use the small Mackie DL 806 digital board and JBL PrX612's behind us pretty often. A single K10 as keyboard and center monitor.
We've been using that same basic setup for 3 years. We have changed boards, changed speakers but the configuration has remained the same. It flat out works for us.
When we go outside I often put another PRX 612 as the center/kbd monitor and we put the K10's on sticks, behind and along side the JBL's as side fill for the guitarist/singer and for me. I love having the K10 in my face. It's like wearing headphones... Really freakin nice headphones... I can go bigger. All the way up the 2 18's and top boxes per side, stereo triamped... If the dough is there...in which case there are stage hands along for the ride...
We do a cooperative carry, everybody has their tasks to complete. We are up in 20 to 30 minutes, down in about the same. Our basic setup is more gear that you're carrying but we have a sound and this is about as efficient as I have been able to make it.
For me the key is less about the amount of stuff and more about the sound quality and being efficient. Having willing band members that know how to work and what to do makes the biggest difference... I'm spoiled