Hi Michael.
I highly recommand class D amps for easy installation (little things), little amp drawing, good audio quality and big power.
A little Soundstream PN5.640D is powering my whole boat. Sound quality is here, and despite it's only 2x80wrms for the tower, with my HLCD high sensitivity (97dB/w/m), it's loud, and clear.
For your budget, this amp seems to be a good deal : https://www.sonicelectronix.com/item...MR4.1400D.html
If I (and I will) repower the boat, I'll probably go for 3 x Axton A200 amps. I don't know if they are imported in the US. It's a German brand, and believe me, those things are loud and HQ sound amplifiers.
Stéphane
-----------------------
1989 Supra Saltare