There's an argument I'll never enter into.

You're going to have to talk about SPL, efficiency and flatness.
I'm out.

I will say that Cerwin-Vega and Gauss 18" speakers haven't always been known for their great efficiency though.
But if you have a 12" that pumps bass
as you like it, doesn't exceed the cone excursion and can dissipate the heat, more power to you.
I myself use an old Carver M-400 Cube amplifier, slightly modded.
200 watts RMS into 8 ohms x 2.
The speakers are Carvin cabs with 15" JBLs and horns.
Passive crossovers.
Good for me because they're loud, fairly flat and make good stereo speakers too.
A good stereo makes a fine amplifier for a non-professional.
If you're just playing at home and have a decent stereo system, there's no reason to invest in a professional rig.
A mixer might prove more useful if you don't have one already.