Wouldn't this be a really good for a DIY shower
 

http://www.amazon.com/Jabsco-31700-0...ag=dealnewscom

I found this deal on Dealnews.com

Wouldn't this be a rally good deal for the pump for a shower install? I'm not really diggin the spray nosel but I could go to lowes and fix that. All I would need is the Y graden hose fitting and a few other parts right?

Are you looking for hot water or just cold water? If you just want cold lake water, you can go super cheap and put a ball valve on your ballast line and make one. You just turn the ball valve and turn your ballast on. I did that last year. Best part about it is I could use that line to fill other ballast bags in the boat for surfing, etc.....

Diggs
Na I was thinking I could use this pump and tie into the side of the block for the warm water and the raw water pickup for the cold water. Then use a garden hose Y fitting to control the amount of cold and hot water I need. Just didn't know if this pump would have enough presure.

Hard to say, if you zoom in enough on the picture you can see it says 50psi / Livewell on the pump. But hey for that price your not out much to try it either. Depending on how much hose you use it might retain enough pressure.