Best 5K used or new for Musical A308cr System

Looking for opinions on speakers that provide exceptional synergy with Musical Fidelity's A308cr system.

Musical Tastes: Rock (classic to current), Blues, Jazz, etc... very eclectic tastes but rock prevails in my colletion of 2,000+ cds'.

My budget is $5K for a pair of used or new speakers.

My equipment is:
Musical Fidelity A308cr Pre
Musical Fidelity A308cr Power amp
Musical Fidelity A308cr CD Player

Room Dimensions: 8' Cieling, 10.5' Wide, 15' Long.

Opinions and experiences would be greatly appreciated.

Thanks in advance !!!

Capnizzy