Ok guys, I know this question has been posted before but I just can't find a good answer. I saw a post last week about a sale on Polk speakers so I thought this would be a good time to go ahead and get my rear surround. Here is the question, with my current set up, what would be the best speaker for my rear surround? Another cs30 or one rti28. I am currently using the cs30 for my center and the rti 28s for my surrounds. Thanks for all of your help.