Two things that I would want if you can find a unit with them that you can afford. The first is color, it's amazing what a difference it makes when you're out on the lake fishing and want to see what's on the screen. Maybe it's just because my eyes have gotten that old. The other is GPS, how nice it is to be able to know where your dock or beach spot is on a new lake that you're unfamiliar with. Not to mention the ease in finding the same area on a lake that you found the fish in the last time you were at the lake. I know my Dad has been pretty happy with his Humminbird 383c, it has both color and GPS, and seems like a lot of bang for the buck. Because I put mine on a cataraft I saved some money and didn't get the GPS. It works out okay because I really like the unit I bought and I can get by with my handheld GPS, but it would be so much nicer to have it all in one unit and not be taking chances with you handheld out on the water.