I've heard good things about the 720PRS, and am considering trying these out to replace my CDT 61's myself. Seem to be a great set at the price of about $250 shipped, but I haven't heard them yet. From what others have said the tweets can be a bit harsh and they sound best active (what doesn't).
I've been fairly happy with the CDT's in my sig and are $170 shipped from WoofersEtc. They sound pretty good but the mid bass is lacking for my tastes. If you want strong mid bass I'd look elsewhere. The clarity is good and they get decently loud, and the tweeter isn't harsh at all.