Speaker suggestion for 600.

I need help on the best speakers for <$600 preferably new, but would consider used if not very old. I have a Acurus A-250 and L-10 preamp, bought recently.

I am considering the Magnepan MMG (with a sub which I already have) and would appreciate suggestions for speakers equal or better in performance ie., sound for this price to audition. Ideally I would like to spend no more than $500 for the pair.

thanks