All depends on what you want to spend, personally, I go with HDS Lowrance https://bestoutdooritems.com/best-fishfinder-gps-combo/ I also used a Furuno, Raymarine, and Navman. All brought good results with the right movement. I think that it comes down to personal elections and how much you need to spend this business personally. I find the 5 inch screens too small when working in split-screen mode. As far as the transducer goes it really depends on what you MAINLY fish for if most fishing is in depths less than 100m you'll be fine with the 600w transducer.Its all about getting the best unit that suits your fishing. Yesterday I came across an interesting video on YouTube <span style="color: rgb(0, 0, 0); font-family: Arial; white-space: pre-wrap; background-color: rgb(255, 255, 255);"> I hope this helps