Yo rjfrieva-

Since you already have the highly rated Infinity Beta 50's - suggest sticking with the Infinity Beta series to capture the synergy of the sounds - i.e:

Center=Infinity Beta C360 ($200 @ Vanns)
SubWoofer=Infinity PS12 ($279 @ Amazon)
Surrounds=Infinity Beta 20's ($110 @ Vanns)
(Total $919 shipped)

verses yours-

Center=Klipsch RC62 ($450 @ Vanns)
Surrounds=Infinity P162's ($100 @ Amazon)
SubWoofer=Outlaw LFM-1 ($399 @ Outlaw)
(Total $1249 shipped)