Humminbird products might be the way to go considering the compatibility options with your minn kota motor, cannon down-riggers, etc....
Here's a few things to consider -
- 700 series and up are Ethernet capable
- 700 series and down have quick disconnects
so, by my train of thought, a 700 series has two great features ......
798ci HD SI - internal gps/chart with high definition sonar, down imaging and side imaging, dual card slots, 5" screen - greatest unit on earth - $ 1050
788ci HD DI - all of the above except side imaging - $ 850
788ci HD - all of above except no side and down imaging - $750
Those are the units with a internal GPS and Chart - I wouldn't buy a unit without this feature .............
If Ethernet isn't in your budget or you don't need it - Look at the 500 series and down.
http://ca.humminbird.com/
Check it out .............