I too have been researching fish finders and saving my $$$. at first I was dead set on a humminbird 597di with chartplotting. couldnt wait for em to come out this month! and I kept saving and now I have 800$$ saved, so I think I have changed my mind and I'm gonna keep saving a little more and get the 798 HD SI combo for a thousand bucks. I'm gonna put it on my console and get a ram mount so I can use it in the front too. I want to use it in conjunction with my traditional sonar to see what I've been missing and miss-interpreting. then maybe next year get a nice down scan model to replace the one up front.