I bet Magnepan MMG would sound nice in that room. Specially with a small quality 8" sub.
I agree used is the best deal although theres always a little risk of not getting what you paid for.
So many good speakers to look at. While I agree box bracing is huge, its not the final judge for sure.
Here are some great used speakers to try & check out if you can find local ads. This is a wide variety and some Just favorites from the many I have owned.
-Magnepan MMG (under 450)
-Magnepan 1.6 & 1.7(prob to big for 10x12)
-Vandersteen 1c
Vandersteen 2 in different series
Legacy classic(Some argue cheap parts, but Legacy sounds good to me)(under 1300)
Klipsch KLF 30 2001or later with titanium tweets & mids upgrades(love them under $800)
Paradigm reference 60's-100's various series(a bit harsh though)
Martin Logan Aeon i (IMO best Logans ever! Only liked the i version with tweeter on rear)
Martin Logan Ascent i ($1500)
There are many others to listen to. Some likely to big for room. Logans are now expensive to repair. Need panels often. If you like to mod or tweak speakers , the KlipschKFL 30's can be easily moded(titaniums, bracing, cross over) and become incredible speakers at their price invested(1200 aprox with everything)