Ahhhh, someone with similar tastes as I!
If you want to fill that garage on a budget, go after some well-kept Klipsch Forte 2's or KLF 20/30's. Prices vary wildly but they are pretty common to find. Also check out Cerwin vega D9's or AT-15's. Either of those can bring down the roof.
For new, anything decent that meets your criteria won't meet your budget. Production costs of anything and everything have of course risen tremendously over the decades. You can buy brand new 12"/15" speakers under $500 a pair, but their quality and longevity might be questionable. These days I'm all about "low mileage used" with my cars and my audio.