It's funny you mention that. I love Pink Floyd and as I mentioned in my previous post, those Sansui speakers had a nice warmth to them. When listening to vinyl which usually also has a "warmth" to it, it's cliche but it is definitely the way it was made to be listened to.
One of my most profound recent memories (within the past decade) outside of the birth of my daughter was listening to Ray LaMontagne's Til the Sun Turn's Black on vinyl on a vintage Sansui turntable through a Sansui receiver all from 1978-ish. My grandfather had just passed and it's hard to describe but I was immediately transported to a different place. It was like sitting in a log cabin next to a warm fire with a cozy blanket on a dark stormy, cold night. It was pure sonic bliss.
As you mentioned, those speakers are probably not ideal for home theatre but they may be great for music. Those older speakers usually have a lot higher sensitivity so they are not as difficult to drive and get loud without having to crank the volume ****. As far as the TV, definitely go bigger. A 55" is only good if you're sitting less than 6ish ft away.
This is a great tool to get an idea of viewing distance to TV size recommendation.
Regarding the receiver, it really comes down to the room correction software. I would recommend researching what models have the better room correction and going for those. That's the main reason I went with my Denon.