x2 on the bigger center. You will notice more improvement from that than you will from adding the rear speakers.
The RC-3ii was a Huge improvement over the C-2 I had. The jump from that to the RC-7 was just as, if not more significant.
since the RC-3ii is discontinued, i would look into the RC-52ii or RC-62ii...
would either of these be okay and compliment the F-30 towers and S-20 surrounds?
thanks all for the feedback so far!