Decent moderate priced speaker for large room

Older mirage speakers can be quite dynamic and sound amazingly good for very little money the money.

Consider Aerial 10t

Get a really big pair of Klipsch or Polk floorstanders. Most of your male tenants will think have died and gone to heaven with these "awesome" speakers, and you wont cry when listening to Jimmy Buffet with Margarita mix dried onto the drivers and few scratches in the vinyl cabinets. I might also suggest a pawn shop receiver in place of your PS Audio... just a suggestion.

There is a pair of Coincident Triumphs for sale $650. Very efficient (92db) so power is of no real concern. Excellent low level resolution. My pair did not come with grills however, so if that's necessary you will need to check with seller.

The Klipsch are a naturally good idea - get the biggest model you can afford. Also, most of the horn-loaded, larger JBLs, old Atlec-Lansing speakers, and the like, plus Cerwin Vega speakers, are other high SPL, high efficiency brands.

Another idea that should work would be the DCM TFE200. At $1K/pr, they are efficient, and I heard them in a large room fed by a 25 watt tube amp. They were plenty loud and dynamic, so with your big room and big amp, maybe it would be a good fit. I think they have a 30-day home-trial so if they don't work, you cen return them. Here is a link:
http://www.mitekfactoryoutlet.com/products/brand.cfm?Cat=18&Brand=6&ProdType=18