Ok my wife asked what Amp I would like for the boat, I am not up on stereo equipment so I need a little help. Wanting to re do my stock system what would be a good amp and speakers to start with, something that stays cool in the heat. Just doing the amp and speaker right now and would like to stay with the 6.5 size speakers.My head unit is a Sony Xpod 45w x 4 should that be changed as well?.