The differences between them, aside from analog and digital inputs, are that the 710T has the ability to pivot, and weighs a few pounds more.
You are correct in that the 710's use 18 bit color, dithered to 16.2 million colors. This should not present a problem as Samsung has an excellent dithering algorithm, the only time I have seen it behave poorly is in movies, when it sometimes renders dark scenes horribly.
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