The 500 will be plenty unless you listen to the lowest notes of the pipe organ.

I like the mini-T. The Axiom M5HP is the poor man's version of the mini-T. It can't reach as low and likely not as dynamic but it sounds similarly good smile Something like fully active M5HPs are in my distant future.

I have 3 sound rooms. All three are contrasts in environments.

It's possible bi-amping is beneficial given your power needs.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated