Speaker choice, amp choices

Dfmcintosh
Dfmcintosh Posts: 2
edited August 2012 in Speakers
First post here.
First of all I will list what I am using now.
Receiver is my old faithful H/K AVR 7200 7x100
Center is a CSi3
Fronts are RTi8's
No rears right now.
Sub is Polk 12, not sure which model, 6 months old.
My first thought is move the rti8's to the rear and upgrade fronts to rti a9, but could my avr 7200 push them to their
potential one, and 2 would they overwhelm my current center? I am not opposed to spending money on an amp for front speakers . I am not opposed to going with 4 rti8's either. Any thoughts on how I can reasonably upgrade? All suggestions and experiences welcome.
Thanks