Best rock/jazz speaker under $10k used

If your room can handle them I just LOVE the Dynaudio C4's.
http://www.audiogon.com/cgi-bin/cls.pl?spkrfull&1290269800&/Dynaudio-Confidence-C4-
Or if there is a Dynaudio dealer near by check out the Contour 5.4's.
That's my opinion

Used Mirage Msi series are great. They have a sound field like planer speakers but have dynamics and bass. I use these with 100W ARC VT100 and Metalica never sounded better!

Dynaudios are a great choice (above).

Also look at ATC or PMC - ATC 50's or 100's (if you really want to shake the walls yet still have a great panel like midrange clarity for vocals)

ATC are installed in Ronnie Scott's jazz club yet rockers like AC/DC like them too. Finesse with ability play extremely loud/dynamic.

Personally, I own the Dyn's and they are awesome speakers, but, IMO, they DON"T do rock very well. And they are super critical so most inferior hard rock/metal recordings sound like schitt.