I would get an EQ with 3 zone controller (incabin, tower, sub) and 3 amps (4 channel for incabins, 1 channel for sub, 2 channel for tower).
you'll need to get fuse block, lots of power wire, rca cables, blah, blah, blah.
I was very impressed with my JL audio D series marine amp. So tiny and easy to install, yet powerful. Also very happy with my exile speakers, harpoon amp, WS 420, JL audio sub, earmark fabricated sub box. My kicker in cabin speakers were 'ok'.