Heya Troy 
There are a few good sounder options which would suit your needs. And pretty much all of the major brands are waterproof and carry a couple of years warranty on the off chance you get some water into your unit.
As with anything the sky is the limit, whats your budget? this might make it easier to give you some advice
You can get entry level sounders for a little over $100 which will find depth and help find structure and fish, but the more you spend generally the more your going to see
There are a few good sounder options which would suit your needs. And pretty much all of the major brands are waterproof and carry a couple of years warranty on the off chance you get some water into your unit.
As with anything the sky is the limit, whats your budget? this might make it easier to give you some advice
You can get entry level sounders for a little over $100 which will find depth and help find structure and fish, but the more you spend generally the more your going to see