What's Next

Yeah you've got nice speakers.  What area of added detail are you looking for?  If it were me I might try experimenting with some cables/interconnects to see if that can give you that last bit of detail you're looking for.  Or maybe even try demoing a different preamp or DAC or something that has a reputation for excelling in the area you're looking to improve instead of changing speakers?  Just some thoughts. 

That said, one speaker in your price range that has continually impressed me over the years has been the Joseph Audio Pearls.  If you haven't heard them it might be worth your while to check them out if you have a dealer within striking distance.  If they don't do anything for you, well, then I got nuthin'.  Best of luck. 

I've listened to Joseph Audio and think their great speakers. I don't like them well enough to replace my Monitor Audio PL 500's with them. 
I'm looking into a couple different options, including listening to different amp/preamp combinations.

keithtexas,

Thanks for the compliment. I understanding what you're saying about MIT cables; however at this point $13K is way, way outside of the range that I could spend on speaker cables.

ricred - I understand; I realize I mentioned the HD90 but maybe the HD60 would be worth considering. Joe Abrams has a pair listed here at about $2800. Also watch ebay.  I was more mentioning a relatively lower cost cable change as an alternative to changing out your speakers (if you generally like the PL500s). Demos of cables are easier than in-home demo of speakers. I’m sure the Clarus are very good in their own right, but I think the ’detail’ of the MITs is their selling point (and what it sounds like you’re looking for more of from your PL500s).