The modern stereo system

I currently have a 25 WPC Pioneer head in my 73.

Pushing incredibly efficient and responsive 5" woofers in ported boxes with real nice soft dome tweeters.

You will want more than 25 WPC for any serious volume.

For 10's or 12's I'd suggest 80-100 WPC
So I said 80-100 and you said 90.....
90 nominal/180 6X9’s vs 80-100 for your what now?
150 nominal/300 peak for my 10 inch sub, vs your 80-100 watt, nominal? Peak? 1 sub or 2 @ 10 or 12?

She did say she loves it loud.... and something about a hard hitting bass..... if such is the case, on a stereo system, there is no kill like overkill.

I had one earlier system (my first multi amp set up in the ‘80’s) a Pioneer 4 channel amp powering the 4 cabin speakers at 30 watts nominal/ 60 peak and a 10 inch sealed su. Powered by a JVC amp @ 150/300, nom./peak.

I’d call this a better balanced system in all though not loud by any means.