Hi, everyone. This is the first post I ever made. I usually fish at Ky. lake, but plan on fishing at Green some this year. I was thinking about upgrading to a side imaging depth finder, but don't know much about them. Can you please tell me which one is the best for the money? Where is the best place to mount it? What kind of transducer is better, a transom, trolling motor, or a thru hull? I have a Stratos 219F, and love it. Thanks for the help...