I agree with the other guys -
Don't get sucked into Gear Snobbery -
If what you have does the gig consistently each week, then don't worry about it.
Put the profits into a savings account or a mutual fund.
(at some point the vocalist will move away, gigs will dry up, or one day you will not be healty enough to perform and will need that cash to live on)
I have seen my share of hard working delta blues bands on a peavey top box mixer and a set of old SP2 cabs.
They havent bought a piece of PA gear in 15 years and still do not need to.
Me? I have been the entire road on this.
I started my own system with a Crate 8 channel powered mixer and a set of JBL Cabaret speakers.
Then I gave that back to the guy I was renting from(15$ a gig) and bought my first system. (yamaha 12/horn Club III series mains on tripods, same cab monitors, Carver PT series amps on mains and monitors, yamaha SPX90 efx, Peavey Autograph EQ, Nady wireless, and a DOD 12 channel rackmount mixer) Had it all in a nice rat fur covered rack. All cables stayed in the mixer/rack so set up took 5 minutes for a 3 pc acoustic act.
Eventually the gear bug(and box of cash) got to me and I sold the yamahas for a DAWN system. dual voice coil 15 inch sub and coaxial 10 inch mid/hi boxes on tripods.
Then parted with the entire rack and picked up a Peavey top box mixer. That was underpowering the DAWNs but I kept a careful eye on the levels.
I've gone thru Club IV series Yamaha mains, peavey wedges, EV mains, Yorkville subs, Mackie powered heads, Yamaha powered desks, Presonus compressors, peavey Eqs, mackie amps, qsc amps, and even a few Community pieces.
So I've seen my share of MI series gear!
I've also decided, SIMPLE IS BEST!
I run the Mackie 808m with drums and acoustic guitar plus 2 vocals 3-6 shows a week. Mains are nearly always EVsx200 tops with a single powered Yorkville es700p sub(dual 10s 700 watt amp on board). Monitor is an active Community 12/horn wedge.
No external anything! And its a solid quiet show every night of the week(plus it takes me one trip from the van to the stage).
I do occasionally add steel pans, lead guitar, or other vocals to this system with no problem.
Rain