I'm surprised you have the Altec 874A Segovia on your list. It's fairly obscure, but it's also the only one I have direct experience with, though I heard the AR3a plenty back in the day as well.
I bought my first stereo in 1972. It was an Altec package deal--the 911A compact, which had a nice Altec receiver with the Garrard SL95B turntable set into the top, outfitted with a Shure M93E cartridge. The speakers were *supposed* to be the 8" 2-way Altec 887A Capri, but the sales person wrote down 874A instead on my sales ticket.
I got the whole package for $419. The Segovias were supposed to be $560/pair. I flipped.
So I got to enjoy them for a couple of weeks before she found out her mistake (I thought it might have been a closeout bundle) and asked for them back. I followed my conscience and brought 'em back in exchange for the Capris.
While I had'em, however, at the time, to those 19-yr-old ears, and without benefit of bookshelves *or* speaker stands, they sounded really good to me--effortless, with quality bass and a pretty linear and dynamic presentation.
I consider them Altec's answer to the JBL L100, but I consider them better in general, and for your situation in particular. The midrange is actually an Altec full-range speaker, which enables it to cover a large part of the frequency range without strain. The 12" woofer has a 17-lb. magnetic structure and is in a sealed cabinet, so there's no placement problem. The tweeter is a textile dome.
In spite of the sealed enclosure, the speakers were easy to drive and the bass was strong but not overpowering, and tight. They were also pretty efficient with a 4-ohm impedance besides, which opens up more wattage from the amp if it has the durrent delivery to allow the amp to do so.
I could see the Segovias for a match for your requirements as well. Bear in mind that the woofer has a foam surround, so either you find a pair that's been recently refoamed, or you'll have to do that (about every 10-20 years). It's not that hard, and most speaker reconing services could do it as well (I think).