Jabbo ... you really don't want a SI unit for the front of the boat, and a DI unit on the front also has its drawbacks. If you have another depthfinder to switch to the front, and put your SI or DI unit on the transom, you'd probably be more satisfied with that configuration. If you're going SI ... Humminbird seems to have the upper hand in that technology. If you go DI ... Lowrance has the better technology, as their units have a dedicated crystal for DI imaging (whereas Hbird units use the SI crystal & processes the DI image from it).