Suggestions on a Musical, Full Range Speaker

I currently have a Clayton M300 SS amps, with Cary SLP-05 & 306 CD player and looking for high end full range speakers that are musical and not fatiguing. Room size is 13 x 21 with 8 ft ceiling consisting of hardwood floor over basement and standard drywall walls. Room has large rug, furniture, wall treatments, and two large openings to other large rooms. Speakers potentially located 10 ft apart and 1 feet from wall. Interested in creating a demo list of potential contenders in the $5-12k range new/used that would be considered class A for the category.