I am am new to Home theather forum. I just want to say this forum is great.( very informative.) I have just purchase some speakers and want some opinions? For the fronts I bought paridigms monitors 11's v3. For the center I bought paradigms CC-370 center channel For the rears I have Polk audio's RC65i in wall speakers And for a sub I bought a SVS 20-39pci For a reciever I have a Denon 3600 I am using a pronto tsu2000 for a remote For a tv I have a 65" Mitsubishi 16:9 high definition tv I have not listened to the new speakers because the are on order. I recieved the sub today and SVS makes a great sub. This thing rocks. I had a polk PSW 150 before. My question is should I upgrade the polks to paradigms inwall speakers. Would the polks sound OK or should I upgrade. I already had the polks for a while and didn't want to mess with mounting new in wall speakers. The second question is my reciever is about 5 years old. It dosen't have the new formats like Dts ect.. It does have AC-3. Should I upgrade the reciever to get the new formats. Would I hear much of a difference. IF so what reciever would you recommend.