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IMO no matter if you have single or twin units...keep a decent handheld gps on the boat (with an extra set of batteries) and when your budget allows get a chart chip in it so you can basically do the same thing that the in-dash unit can but on the smaller scale.
Bottom line...IMO plotters are pretty similar, pick the chart chip you like and then pick the machine that supports them. Don't forget to check out the at-home computer software so you can play with plotting courses and alike from the comfort of your desk.
Then decide your your favorite FF and consider machices that offer both.
The trade off is really the "relaiability argument" vs screen size. But since the reliability is pretty decent nowadays and you have a back-up gps (which is just as capabible as your primary) I don't think that argument is as strong as it use to be. IMO get the biggest screen you can afford that fits on your boat. Bigger is better, no question. To see a big full chart or a big FF display is sweet....you will like the larger screen.
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