Sam, if you are happy with the Garman and it does every thing you need it to so go for the stand alone depth finder. I have the Furuno 585 which is the 8" screen (the 620 is the same machine with a smaller screen I believe). It is great for pinning you on structure and marking fish.With a combo machine your screen would be too small for the time you would need it most. When looking for a wreck for instance, you would be using a split screen. One side for the chart and the other side for the depth finder. You would use the chart plotter and depth finder at the same time and would have a difficult time seeing any detail on both sides of the screen. Another advantage of a stand alone is if one of your machines too a dump and you had to send it out for repairs. You would at least have the other machine functioning.That is my opinion, I'm sure others will have a different one.I couldn't agree more.Its one of the points I tell all my customers when looking for electronics. I personally have a Furuno FCV 600L bottom machine and a Standard Horizon chart plotter. If you have the room, stand-alone units are great. But there are some great combo's to be had if you go with a large screen unit. One thing to remember, Customer Service is most important. From the manufacturer right down to who you purchase it from.Capt.Matt
If you have the room, 2 machines is the way to go, Lowrance makes nice machines, Ikat Dennis knows all about this stuff.
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