Best garage speakers

I need two good garage speakers to fill 900 sq ' and to sit against a 30 foot wall. Eyeroll, I know, this is a sophisticated forum but help an old guy . We 4 guys have a few whatevers and listen to good tunes after fishing in northern Mn . I have a Yamaha RX-V992 receiver. Bookshelf or floor speakers are fine. I have room for a sub too..I'll spend up to $400-$500 for a used set on Marketplace or this site. What would you look for to buy