I'll say this...sometimes...the best deal $$$ wise isn't always the best deal overall.
If you are new to the more modern chartplotters/fishfinders and their installation, set-up, and use, using someone like David from Shut Up and Fish may end up being a better deal. They can give you assistance, advise, and even install it. This will limit trouble and put you on the water faster, with an understanding of your new electronics.
Texas Crappie Posse