used speaker recommendations

I'm relatively new here.  Am in the process of upgrading a 2-channel stereo that is currently: Wharfedale Jade standmounters, Cambridge CXA-81, SVS sub, Bluesound Node2i streamer, Graham Slee phonostage, refurbished Dual 1228 with NOS Shure V15-III/Jico hyper-elliptical, various Pangea cables.
I like the "british sound" having around the house both Mission and Celestion speakers.  Nothing too bass-heavy or overly bright.  I think musical, rich, warm, detailed but not fatiguing.  Type of music I listen to: Argentine tango (Go-tan Project), Van Morrison, Sinatra, Ellington, Pink Martini, Chicago blues.  When in the mood I love the Rolling Stones. 

The room is small, 15x13.  I am currently building some tube traps and acoustic panels.  WAF necessitates standmounters.
Budget is $1500, tops.  New, I would probably stay with Wharfdale.  Lintons, perhaps, but the reviews of the Evo 4.2 are uniformly good.  My real question for this forum, though, is on the used market because I am unlikely to be able to audition most of what is offered for sale.  There are a number of interesting options in my price range just looking at Audiogon and USAudioMart.   For example: KEF LS50 and R3, ProAc Response 1sc, Spendor SP 2/2 and 3/5, Tannoy HDP/315/8, Revel Performa M.20.  Then there are the non-british brands that might fit the bill like Sonus Faber Concertino/Electa/Venere/Luito/Minima.  Yikes.  Any thoughts would be greatly appreciated.