My ancient Humminbird finally crapped out on me and I need a new unit. I have $650 in Basspro giftcards from Christmas that I can use so would like to keep it in that range. I'm not really a bass fisherman but love to troll bandits for crappie in the summer and that will be it's primary use. So much has changed since I got the basic unit I have used for the last 7 or so years that I don't really know what units may be good or bad. I would love some suggestions and recomendations from you guys that know whats what. Bass pro has the Humminbird HELIX 7 CHIRP MEGA SI GPS G3 Fishfinder/Chartplotter on sale for $650 and I have looked at that but really don't know. Any help welcome. Thanks guys.