A speaker I've always liked myself, but aren't all that easy to find, in superb condition usually surpass their new cost, and would perhaps be a shipping nightmare- costly to ship, would be a JBL Pro Studio Monitor from the 4300 Series, such as the 4331, 4333, 4335.
These may not be the "imaging Champs" of all time, compared to more costly speakers, but as far as slam, clarity, power handling, bullet proof build, and the retaining of value-cost outlay, you probably wouldn't find a better speak ever built for the money.
The speakers that I mention above IMO will literally eat Klipsch Cornwalls for breakfast (And a lot of other multi-thousand dollar boutique speakers also).
Sure, many times, the 4300 line came either painted Blue, or even white, but they also did produce many with a nice walnut veneer. Guess many of these found their way into homes as much as Studios.
The Home of the Theater version many times were grey. Not much to look at I admit.
But akin to the old saying "Whattya want, good looks, or good sound"? lol
While the Cornwalls have a big-deep sound, and very high efficiency, so do the 4300 Series of Vintage JBL's, but the Klipsch Cornwall IMO lack the degree of articulation, detail, the ability to produce phenominal Mids, and tight clean Bass, dynamics, speed, and overall quality sound of the the large 4300's.
Ever see a Cornwall in a recording Studio?
Of course this is my opinion only, I've always been a big fan of the vintage JBL Lines, and others, or yourself may have different wants, and needs, so mileage may vary. Mark