I am looking to buy a new fish finder. I currently have an Elite 5 DSI, didn't know much about fish finders when I bought it and have now learned I need more than just the downscan to find fish. I have been looking at the HDS 7 and Elite 7 and wondered which one was better other than just price. Also what transducer do I need? 83/200, 50/200 or the 83/200 with Structure Scan Bundle? I mainly fish central Texas lakes for whites and crappie. I am on a budget here but want to get a worthwhile fish finder that will do the job helping me find fish and have something that I can keep for years to come. Any help would be appreciated.