Good Speakers for Rock and Roll Under 15K

@atmasphere is correct. No reputable recording studio would pick monitors that favor one type of music or another. ATC, especially their active speakers, can play very loud with very low levels of distortion while being extremely reliable; why they are found in many of the best studios. And yes, a well recorded orchestra at concert levels will place a greater demand on speakers than most rock performances.

Stuff in your budget worth auditing...

15k - Yamaha NS5000

11k - Borresen X3

But, you will need to put that flea watt power amp away for either speaker and get a pair of Schiit Tyr monoblocks. Those 350 watts will make either speaker kick like a mule.

I find listening to rock vs jazz, instrumentals or classical are totally different.  With Rock I am listening to guitars, drums, and maybe a piano.  I am listening to the overall beat and vibe.   Rock and roll recordings are meant for dynamic speakers.  I don't think you are going to be in a room and picturing where the lead guitar is vs the bass guitar.  That is why I would go SS and Texton or ATC if that is all your are listening too.  

The Op has great amps probably from Gestalt Audio if I were to guess.  I have Horn speakers that are 98DB.  I truly love horn speakers for my Jazz, Classical, and instrumental listening.  Rock and roll do not engage me in serious listening.  I think it is all about the musical instruments and being able to hear each instrument.  Rock and roll is dynamic and in your face.  I would not even use a tube Preamp for just rock and roll.  I am not saying that my speakers do not play rock and roll good either.  I am saying that a dynamic speaker is what I would get if all I was interested in was Rcok.

I am curious what the op is going to do.  

ThePerlisten R7 Loudspeakers are excellent and will play very loud without breaking a sweat  and very musical for any type  of music at $10 k 

before discounts a true audio bargain  checkout the reviews on YouTube 

Zu