I am looking at buying a side imaging sonar for my boat. I am still deciding between Humminbird and Lowrance. However, my question is would you buy the unit this season or wait until next season. Currently the Lowrance HDS Gen 2 are several hundred less than the HDS Gen 3. This price difference is very similar when you compare a Humminbird 900 series to a Humminbird Helix What are your thoughts? Thanks, Rob