We have a pair of HR824's, KRK RP-8's Alesis M1 mkII's, ADAM P22-A's, and a pair of JBL 1-point monitors in the walls. The RP-8's are very similar to the HR824's, they have a bit of their own character but really if you had to do a blind test (in our room) they sound nearly identical.
~e.a