Killer Floor Standing Speakers under $4000 for Rock?

Golden Ear Tritons 3+ 2 or 2+ or 1s you won't be disapointed.

I'm currently listening to the Transiberian Orchestra at concert levels on my Zu Definition IIIs.  Zu, Tekton, Tyler Pro Dynamic series and Legacy Focus -- I have owned them all and they will all meet your criteria.  The Zu are the most dynamic (also the best for vocals and guitar), the Tylers are smooth, slightly warm sounding, and the Tektons are somewhere in the middle (the Zus and Tylers are the most efficient).  I still own the Tekton Lore (had the Pendragons) - they are amazing for the price.  On your budget I would probably go for the Zu Omen Def Mk II.  Don't hesitate to call and talk to the owners -- Sean and the gang at Zu are awesome, and there is not a better person in all of audio than Ty Lashbrook.  Eric Alexander has always answered my calls and been extremely helpful as well.

BTW, just be aware, the Legacy Focus and Tyler Pro Dynamic speakers are huge -- a real pain to move around by yourself!

You can try the Revel F208's they Rock used at 3,500.....as well as the much more expensive Salon2's, both speakers cranked clear and clean beyond recommended dB levels for your ears! I'm using the Devialet D200 crystal clear with Nordost Red Dawn Cables.......

There are so many choices...the old B&W 808 monitors are by all accounts great for rock (as I understand, it's what they were made for).

I've owned both the old and new Legacy Audio FOCUS loudspeakers and agree with many here that they are a solid choice and generally a great value used. Not sure that I agree with statements suggesting that the older model sounds better...although it might depend on the room and electronics. I've found that the SE version is significantly better than the older model in every audio category (bass impact, extension, smoothness, midrange clarity, micro-dynamics, soundstage, etc.), even though it has one fewer 12" woofer per channel. I had both the old and new models in my listening room for a month before parting with the old ones with no regrets:

http://www.dsnyder.ws-e.com/photos/potn/FOCUSx2.jpg

I have since had the midbass drivers and tweeters updated, and they are even better as a result. One of the great loudspeaker values.

At a lower price-point, the Tekton stuff looks really cool. I'd also love to hear the JBL Studio 590:  http://www.jblsynthesis.com/productdetail/studio_590.html