I have the CSi5 and a pair of the RTi4's (as surround backs). They are absolutely fantastic. A good friend of mine has the Paradigm Monitors - a full 7.1 setup. We both run Denon receivers. I think the Paradigm are a bit more efficient, with better bass, but I prefer the mids and highs of the Polks. I swear by Polk tweeters - smooth and very clean. You cannot go wrong with either. We both demo'd all different types of speakers together, all over Dallas TX, and Columbus, OH and based on reasonable budgets, felt the Polk and Paradigm lines were the best for overall sound and value in the higher mid priced speakers.