I have been planning on upgrading from my Humminbird 565 to a Lowrance X136-DF. After doing some browsing, I am leaning toward the Lowance X515c-DF. The X515 is very similar to the X136 other than the 515 being color and a few other options. Does anyone have any experince with the X515c-DF? Money is a factor so please limit the recommendations or discussions to the models I mentioned. LOL. Sure, I would rather have a Humminbird 1197si, but it aint gonna happen. Thanks all.