Looking to get the most for the money in a fish finder. I've been lucky enough to fish a hole in the ice next to a mid-level Vexilar and what a difference it makes so it has got me wanting. What I'm not able/ ready to do is spend $400. So I'm putting it to you, is there a useful/reliable fish finder for a tight budget? What are your experiences? (ex. Markum's hand held digital ). I'd like to be able target lakers and get a sense of bottom structure.