I would recommend don't upgrade your Amp for the LRS unless you are able to hear them first. IF you first listen to the LRS and love them, then go for it.
per a long and thorough review by Audio Excellence Canada on Youtube, the LRS is NOT an audiophile speaker. it has good soundstage but does NOT have good imaging. they say "what it does well is beautiful" but i am not sure what that is yet. These guys are SALESMEN for the LRS - they would not talk bad about them, so when they explain some of the good points and bad points i tend to believe them.
From my own experience, they do have a nice sound stage that is not as boxy, but the sound image is kind of nebulous - less precise detail. And they certainly can not handle loud rock music as well as more traditional box speakers. Who knows, maybe i don't have them spaced out correctly.
Good luck to you!