Where do you plan to do most of your fishing? If you are going out in the gulf a lot, then more powerful unit with GPS may be best. If you are fishing inshore in shallow water, your FF is more of depth finder to see structure, etc. and you may not need that power... I fish mostly inshore and have been using the same Eagle Cudas (Lowrance) for years. Cost under $100. Run all day on AA battery packs. Rinse them off and they are good to go