I've had that poster in my shop for awhile now. Its my go to 'What are you doing today?" answer.
Just bought a 1984 boat, motor and trailer to teach the grandsons about fishing and boating. It needs a lot of PO un-puttering.
QSC is what I use Crown and Carvin are also good, I would stay away from the low end brands. I just put stick on feet on the bottom and stack them. They flow air horizontally. I use them in my main 2 channel bi amped system with the fans disconnected. They never even get hot.