Keith,
Thanks for the information. I do have a center but its a cheap JBL and I'd like to replace that eventually as well. My problem is that I have a strange shaped room so I'm going to have to get creative when comes to speaker positioning. If I can't find the C5/6s do think the newer RS3-IIs will match up well? I have my system set up the way you recommended with the bass out from my reciever set to 0. Any more and the powered subs just take over. Do also have the 300s? I haven't seen anyone else mention them.