High Brave is always good (just use someone else for Move-Find Item at the end of the game). As for Faith... I usually use all mid-to-high Faith units just since I like support magic. Faith is a personal preference type thing, though if you have a low Faith unit you might want to have a non-Faith based revival (Ramza's Wish, Punch Art's Revive, Item, etc) unless your Priest has good compatibility with them. Mainly since LFT has a bit higher damage output than vanilla so your units can die before you can do things about it.
Or you can just do whatever you want and if it becomes a problem, adapt accordingly. =P
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No amount of planning will ever replace dumb luck.