I have a Rega Jupiter/Cursa/Exon setup that I'm running with Vandersteen 1C speakers, with a PS Audio power regenerator on the front end. My room is about 12 x 17, with the speakers 9 feet apart on the long wall. There are relatively large openings to two other rooms. The Vandersteen 1Cs sound GREAT in my room and at $1,000 brand new I'm truly convinced they must represent the best value in audio. They pair well with the Rega gear (also great value!), with tons of texture, imaging and soundstage depth. You might check out the Vandersteen 1Cs.
I have nonetheless been hankering to see if a speaker upgrade can take me to another level. I've been most interested in Totem Forest, Totem Mani (never heard with the Exons -- would they work?), B&W N804, Focal Profile 918, maybe older Proac floorstanders, or Dali Helicon 400. I want to stay in the $2,000 range and keep looking for local sellers who I might be able to get to do an audition in my living room with its limited setup options, since the room will greatly define the results. The bookshelf speakers I've tried (Quad 11Ls) weren't enough for my room that is only slightly bigger than yours. Are you sure you don't want to try floorstanders? Other speakers I might look at if the opportunity arose include smaller Dynaudio, PMC or Audio Physic towers. The fact the Vandersteens sound so good means I don't have a strong sense of urgency.
By way of a tangent: an obnoxious thing about the Totems for me is that speaker cones are truly an attractive nuisance with kids, and Totems don't have grills as standard equipment. Having once had a woofer damaged by a visiting child's probing fingers, I want a speaker with grills that I can easily remove and install, and the velcro attachments for the optional Totem grills seem ugly and unfortunate to me. They look more natural on the Totem bookshelves but kind of ugly on the Forest.
I have not up to now considered The One but will do so based on these posts -- thanks for the ideas. Sorry I can't comment on the specific question you are posing. Hopefully other people will sound off. By the way, what speaker are you using now?