Never owned a GPS/plotter unit before. Been reading all the good post and info on the BOC and reading many different websites in regards to a boat mounted unit. In order to shorten the list of choices, these are the "requirements" I want from the unit coming out of the box (new). - unit to trandsducer cost around $500 or less - GPS/plotter - 12 channel - compatible with Navionics HotMaps Premium 2007 (lots of my local lakes) - single transducer, wide cone, built in temp - high speed/hyper scroll - 5 inch screen min. - color screen is optional. Would like color, but not at the cost sacrifice of the above requirements. In general, I don't have a brand loyality or opinion here since I have never owned one that has these capibilities. I started at Navionics website to shorten the list of choices. I have not researched beyond Lowrance, Hummingbird, and Eagle ... yet. From these three names, I keep coming back to two models that seem to fit all of the above. One has been discontinued, but still findable. They are the Lowrance 480M and the Lowrance LCX 17M (neither color screen). Any opinions? Have I missed something?