New or used speakers

Hello all,looking to get a  second set of speakers for my main room.  The room is 14x21x8. Treatments on the walls and bass traps. The bass is kind of hit and miss I guess because of the size? Anyway heavy bass speakers are OK. I don't like ribbon or airmotion tweeters. My tweeters now are Seas Millennium.  I like the sound of domes. Rest of the system is Roon Nuecleus, Lumin U1 mini with sbooster,  Audio Research  Ls28se, Audio GD r7he mkii  dac, I have a choice between Parasound A21+ and Prima luna evo 400. All interconnects are Kimber Hero balanced. Speaker cables are AQ Rocket 88. I have been bi amping Tyler Acoustic Halo extreme speakers. I don't like bright sounding or horn type speakers . Budget is 10k. New or used. Thanks.