Welcome!
I have a frugal friend who got into audio a few years ago after buying, restoring, and reselling a truck load of old speakers. His room was similarly shaped to yours (but only accommodated a wide layout) and so settled for quite a while on a Fisher receiver and a string of SDAs as well. A restored Fisher should serve you well. What's the power rating? The SDA's effect is more of an acquired taste, seemingly exaggerated by conventional standards.
You'll find in general that modern gear has a "tighter" more defined sound, along the lines of what we used to call a European flavor. You missed the digital growing pains of the 80's/90's. Tidal music service (CD quality real time downloading for $20/month, millions of albums available) is wonderful for those without a library. Lots of inexpensive/quality digital sourcing available nowadays. Have fun.
