ok i've come to realize i need to update my fish finder. My current sonar will not mark fish beyond 75-100' of water (garmin 300c). I often go cod fishing and usually end up fishing between 200-350' of water. I want a fish finder only, not a combo unit (i have a nice chartplotter). I'd like it to be color and a 5"+ screen and for under $1000.....suggestions??? thx!