I agree with the general sentiment from bluewizard and alan0354. Money wise spend it on speakers, speakers, speakers, then the other stuff. That's what I did, when building a system I stretched the budget on speakers. The other components such as receiver and Oppo, were less than a third of the cost of the speakers.
I do find myself lately wanting more in the receiver/amp lately or a better source, but I just can't decide. Seems I made pretty good selections to start with because no matter how much I could spend, I can't find much that does everything my current set up does.
And yes, a sealed rythmic 12" would be more than enough for music.
Supercharged Song Towers, Oppo BDP-203, Anthem MRX-520, LG B6 OLED
Headphone Rig: Oppo BDP-95, Burson Audio Soloist MKII Headphone amp/ Sennheiser HD800S, Sennheiser HD650