A price range that you are willing to spend may get a few more opinions.
If you have $2300.00 to spend and are dedicated tournament fisherman the the Humminbird 1197SIc is the absolute best for that money.
If you have $1600.00 to spend and are dedicated tournament fisherman the the Humminbird 997SIc is the absolute best for that money.
If you have $1000.00 to spend and are dedicated tournament fisherman the the Humminbird 798SIc is the absolute best for that money.
If you are in the 4-600 dollar range then i would go with the LMS 500 Series from lowrance. These are also excellent units. Though the side imaging from Humminbird is the real deal. I only wish i could afford them, so for now my LMS 520 c will have to do.