I'm always reticent to make suggestions, but I have paid some attention to speakers in your price range (it was mine too). Given your desire for "Transparency, detail and sound stage," I'd suggest you consider the Dali Helicon 400. They sell for about $2,500 used and I think their strengths align well with what you're after.
I'm driving a pair with a KT-88 based amp; they have a kind impedance curve, so they're easy to drive.
Good luck.