Gary,
I use a basic combo GPS, chart plotter & radar unit on my H33. Never had any use for a fish finder. I swear by this combo because I do my cruising outside in the ocean (north Florida to the Keys). My specific unit is a Raymarine C-80 which is not too pricy but complete, for what I need. I use the Navionics software and everything has worked great since I installed it in 2006. I purchased everything on-line (even better prices at the major boat shows) and paid for the installation on the things I couldn't or wouldn't do (radar).
Good luck!