A few questions to help you get a good reponse from anglers:
-What's your budget?
-What are you style of finder are you looking for? (i.e. panoptix? flasher style? graph style? Screen size?)
-What are you currently running in terms of electronics (if any).
Personally I use a humminbird helix year round, ice ducer in winter then open water one in summer.
Loads of options but it will come down to what you wanna spend on it and how good you are with newer electronics and their interface software.