If it has to be floorstanders I'd agree strongly with the Silverline Prelude recommendation given your stated priorities. I've only heard them at shows, but they really wowed me along with lots of others in the crowd with their remarkable imaging and transparent 3D soundstage. Hard to see you going wrong there assuming they mate well with your equipment and room. I liked the PSB and Aperion recommendations as well, and I'd throw Epos in there too based on what I've read but haven't heard any of them them first hand. Best of luck.
