The JMLab 926 are nice speakers. Full-bodied sound but detailed. I would try to match it with other JMLabs (Chorus series I think is in your budget). Otherwise consider PSB or Totem. You can get away with using monitors in the rears since there's usually less sound directed to the rear speakers. (I know, it's not absolute, but works most of the time.) You could also get PSB Stratus series speakers that are floorstanders for the rears (consider the Silvers) and a center channel as well. All in budget.
Michael
Michael