As an owner of both Klipsch (RF-63) and Axiom (M60) speakers, my advice would be to go with the Axiom's. The 63s were the first speakers I purchased and I got the Axiom M60s about a year later. The RF-63s are the second to the top of the Klipsch Reference line, behind the RF-83s. The 63s retail for $2,000 and the 52s retail for $700, while the Axiom M60s are $990. I have never heard the 52s but I think the 63s would out shine them in just about every audio aspect. That being said, after getting my M60s I have found them to be far and away superior to the RF-63s. Don't let the price tag fool you, the Axiom's are half the price (before a dealer discount) but are an excellent speaker. Now, before getting my Axiom speakers I was very happy with the Klipsch. People like to say the Klipsch are "forward and bright", which I never thought until after hearing the Axiom's. Anywho, to make a long story short, my advice is to go with the Axiom's. If you don't like them you can always send them back for a full refund, but I think you'll be more than satisfied.