Best garage speakers

That is a lot of square feet for a Bose 901,  If you can't find the VMPS floor standers, go with at least a horn loaded, or super efficient speaker.
The Bose, The Dalquist, that kind of speaker, your amp is gonna run out of gas real quick in that big of a room.. It's your $$$, you can still buy REAL smart, The Heresy is a great speaker, just will need to add a sub.
VMPS, no sub needed, really they will out do ALL of the suggestions, I've had most of them, at one time or another. 

Close to the 500 pairs of speakers I've actually owned, 130 pairs, I made or designed over the last 45 years or so.  VMPS is one of the few besides the older RS Infinity speaker line, I still tinker with. Infinity just isn't efficient enough, but surely good enough, with enough amp behind it.

Regards

You can buy a new pair of EAW designed Mackie SRM450 1000 watt (powered) PA speakers that could blow the doors off your garage for about a grand a pair. I've used these in various forms for pro sound work for decades, and they're virtually bulletproof, very well designed, and sound amazing. Used pairs of these things are cheap, and no "home audio" speakers I know of can play as loud and clean as these things. I use an "unpowered" pair of the smaller 10" woofer version in my studio with a sub, and for live stuff also. They're even cheaper.

Klipsch Heritage series. 

Used Bose Acoustic Wave Music System Two 

 You will LOVE IT !

Thanks for the help on this. I bought a pair of Forte ii's. The Forte's look like new but haven't had any of the updates I've read about. $600 was a little more $$ than I wanted but their fanbase indicates I  have heirlooms that can be passed on for generations. So now it seems they deserve an amp to validate their sound capability. I have a Yamaha RX-V992 up at the lake. I'm going to try  find a better power pairing for it . Maybe a tube amp. Any suggestions on an amp that shows up for sale often that I could watch for. Thanks so much to everyone on this.