A little off topic, but I tried LS3/5As back in the 70s. While they sounded good, I ended up with the Rogers JR149s with the cylindrical metal enclosure. I believe the drivers may have been the same or similar but found the JR149s to be much less boxy sounding and to have incredible imaging. I regretted selling them to a friend in the 80s. They are still sounding great in his second home.
I gather you're committed to a new pair and the used ones around can be very rough. Just my somewhat related experience from way back. My apologies for intruding on the OP.