I just got a boat and want to get a good fish finder with GPS and I was looking at the lowrance Elite-5 DSI or the humminbird 597 ci hd di. I want it mostly for crappie fish. So what one would you recommend or another one? I read some where that some show the bottom good but will not show fish. I want to see both. I will be fishing on all new waters so the GPS is a must, mainly to find the boat launch. Oh and it needs to be REAL user friendly. Any in put would be great. I want a transom mount. Thanks