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