That's quite an impressive array of equipment! Looks like you have all possible sources covered. I haven't heard Thiel speakers before but they get quite a good write-up in various places (e.g. Stereophile magazine). How do you find them?
HI Scott, sorry for the late reply.
Before the Thiel's I had Rega Jura, Bosendorfer, B&W Nautilus 802, Various Magneplanars, but the ones that really shine overall are the old Thiel 2.3. I bought them for a fraction cost of the other speakers mentioned above, but they satisfy me as no others could.
One thing though: they need the power of the 500 to really shine.