I had the HB Helix-5 SI for a couple years, its a really great FF w/SI and GPS for $500. I did a ton of research and this was the most bang for the buck for entry level SI with GPS. Its as good as any $1000 unit but with a smaller screen. I used it exactly like you do, on the console with a swivel mount. Save your money and install yourself, just follow the wires on your boat and replace them with what comes in the box. For example, tie bailing string to the end of your old transducer cable before you pull it through. Then use that string to pull your new transducer cable through. You could buy a trolling motor mount for the old transducer and throw that old FF on the bow.