What if Wetsounds is overkill?

I'm trying to get a setup together to put into my boat in the coming weeks here, and I'm wondering if I even really need a Wetsounds setup. I mean I sure as hell want one, but then again all I do is surf - I don't need to hear it at 80'. Anyone able to suggest some high quality alternatives? I want something that pounds, but I don't necessarily need something that can be heard on the other side of the lake.