Best Speaker

Here we go. Mt room is 21x18 w/10' ceiling. My system is Theta Casablanca, Theta David DVD/CD, Aragon amp 8008BB(L/R),Acurus A250x3 (center/rears), Transparent Music Link Interconnects (balanced L/R) and YES bilieve it or not Def. Tech. BP2000 w/CLR2000 center & BPX Rears.(Velo. Sub 15 movies only) My choice in music is VARY wide. From POP, Jazz, some classical and others. I listen to my sysyem as it is and rarely adjust the subs on the Def. Techs.(There set about half way) Given this I would like to be able to listen to my system with a more realistic sound stage, i.e. less Bi-Polar Smear. AND want speaker that can move more air with a littel move volume since my theater is now larger then before. Have listened to Snell XA 90ps, Dunlavy 4, Duntech Regent and Wilson cub.Like the Snells but are a bit Lean, Dunlavy&Duntech only listened to in showroom. Want what ever I get to be under $5K used, then add center/surrounds. I feel like I can get away from a powered speaker and use sub to assist should I want (not likly), but somewhat lean toward a true fullrange maybe slightly warm sounding speaker. So what do YOU think is the best direction to look/listen given this info. I am willing to upgrade my amps depending what speaker I get or I will Bi-amp with more Aragons. PLEASE ADVISE!!!