I'm in the middle of picking some new speakers and am considering the two you listed. Have you listened to them?
IMO, and not surprisingly, you get a little bit more of everything with the studio 60s: better clarity in the mids, better extension in the highs, and more depth in the bass. But as I'm sure you know, you also are spending >$1000 more on the studio 60s so it's not an apples to apples comparison. I listened to both these speakers, but in different settings, and for me the studio 60s aren't worth the premium over the RX6. I also think the RX6 will be an upgrade, and you can spend the rest of the money on more subs if you don't have enough already
My favorites so far have been the RX6 in the ~1k range (compared to B&W and PSB), and the Focal W and Kef R series in the ~$2.5k range (compared to Paradigm). But as you will most likely hear from everyone who responds to your thread, it doesn't matter what we like, only what you've listened to and enjoyed.
If you want more suggestions in a price range, let everyone know what you want to spend. You'll also get plenty of recos of ID brands as well.