Congradulations! A big deal. My partner and I met in graduate school 36 years ago. We put together an increasingly good Home Theater for us, while I put together an increasingly good audio system for me. You can see the systems u der my UserID.
You want all the same HT speakers… the quality is not nearly as important as they are in audio. But the same voicing is critical. Definitely a good OLED TV. We researched the daylights out of the subject and concluded a High end Sony was very worth it. For us the TV is a minor expense…. Audio portion… maybe $35K and monitor $5K. The Sony OLED very worth it… we bought a regular 65” for the bedroom and 78” for the home theater… Both were replaced under warentee. The OLED has a 18 month warentee… good thing… it pooped out after 16 months. The 65“ died in 10 months so got replaced under the 12 month warrantee. Sony has the highest quality rating… I would spend the extra.