Help with fish finders for ice

[Fin-Addict]

I'm wanting a fish finder for ice fishing and don't know the best way to go. I currently have an Eagle Fishmark 640C mounted to my boat and have thought about converting it over but I would rather just get one just for the ice. Can anyone please tell me what is the better way to go, a normal one like I have or a flasher? Also which brands should I look for or stay away from? Any help would be appreciated.
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