End of last year I bought a used pair of Eggleston works Andra speakers. Based on their sound I'm guessing any Eggleston works speakers (for what you're talking about you could go with a smaller speaker from them) would foot your bill.
Definitely not bright and the mids are exquisite. (Bass is equally fantastic but that doesn't seem to be a driving force for you and more to the point I think likely their other speakers if you find something smaller than what I got will sound equally good in the mid\highs region)
On a side note I'd not be afraid of keeping an older speaker if you love the sound you've got. I've got a pair of Wharfedale stand mount speakers I bought new somewhere around 1988 and they still sound great. And without question they've worked hard for many years lol.
E.