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Yes, it is mainly location dependent as you say. An 80 cm dish will work well for most FTA satellites covering North America; the exceptions are in the fringe areas of the footprint, primarily Atlantic Canada and some of the New England states. I always use 90 cm dishes for my customers since the increase in signal strength is substantial and the cost is only marginally more. On the other hand bigger dishes have higher wind loads and therefore could get blown out of alignment more easily. That's in theory mind you; I can't recall the last callback we had because of wind related alignment problems.
Bottom line -- go for a 90 cm.
Hope this helps.
kat
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