Audio Guys, need some advice.

This is my winter project and I could use a little help. Ive decided to do a system on my boat and here is my list so far...

Exile Audio XM7} - 2 Pair

Amp - Need help on which one. Will only power the 4 tower speakers.

Alpine Deck - CDA9886M

Battery - Deep Cycle?

High Amp Alt. - Where will I find this, what amp do I need. The boat is a Mastercraft Maristar with the 5.7 Chevy 350

Wetsounds EQ WS420

Wetsounds XS650 - 1 Pair

I'm excited about this if you couldn't tell. Im just looking for some thoughts on this system for the guys who know. If you feel im missing something just let me know. All opinions are welcome. One last thing, what do I need to make the ipod sound the best it can. Ive read about hooking it up to the EQ, is that the way to go?