Lowrance has the (HDS-10) Highest-Definition Broadband Fishfinding model on the market. It uses broadband which claims to provide: Less Noise, More Targets Crystal-Clear Clarity Greater Shallow-Water Detail and Coverage Incredible Deep-Water Performance Expandability at No Extra Cost Humminbird has the SI models. See what you never saw before, but sacrifice 2D performance. (Most people I talk with state 2D is not on par with Lowrance). Even guys I know that make some big $$ fishing, run both models. Lowrance or Humminbird... What is more important to you? Side Imaging, or crystal clear 2D Views with the broad band? If you were going to buy one of the top models, what would you get? Remember, Lowrance is releasing an SI version.