It should be interesting to see what Humminbird will do to respond to the new Lowrance Elite-7 HDi. Their (Lowrance) Elite downscan only units were a bust, but at $699. this new unit with GPS Mapping, Downscan and Broadband sonar, this unit is going to sell as fast as they can make them. Colour me impressed.
http://www.lowrance.com/en-US/Products/Elite/