Wow brother, the post is pretty mixed up. You've repeated the message within the post several times. Let me try to dissect it for you.
For sources, you have:
Panny blu ray player (8K)
Playstation 5
Latest Xbox
Audio Technica turntable
For speakers, you have:
jbl 305 mk2
Your post does not list what you are currently driving your jbl 305 mk2 speakers with, nor what you are watching your gaming with, so I'll assume its just a generic tv.
You list the following things that you want:
Better turntable, Rega or other...
Gaming headphones, with 7.1, excellent sound
Audiophile headphones for heavy electronic styles of music(no acoustic), -except for classical music as well.
2 subs, subsonic performance(below 20 Hz) for movies
That's quite a list. You need something that will run a blu ray player, 2 gaming consoles, and a turntable. It will drive your jbl speakers and headphones, plus 2 subs. For everyone reading, the speakers are powered, so the avr needs to have pre outs too.
So this solution amp needs to provide 7.1 to headphones plus a 2.2 speaker set up. It really sounds like you need an avr with pre outs, 2 sub outputs, and has a turntable inputs. I like Denon.
Denon AVR X3700H. Not cheap. The preouts to run your powered speakers are the expensive option. Get some non powered speakers, and any avr that has 2 sub outputs plus a turntable input would work.
For subs, I recommend the company HSU Research. Depending on your room size, 2 of their 10 or 12 inch subs would be amazing for gaming and movies.
For turntables, I think Rega would be fine.
Gaming headphones I'm not sure about, audiophile though, Hifiman or Grado at whatever budget you have, would be great options.
Good luck.