You don't need to watch for UNIT_AURA to get the ghost status. UNIT_HEALTH suffices because dead and ghosted players have different health (yes, this is strange).
UNIT_HEALTH_FREQUENT (UHF) is just the same as UNIT_HEALTH (UH) but fires a lot more frequently. I personally find the lags of UH hardly noticeable and as I don't play a healer I'm not that interested in health status, thus I use UH for my raid frames. The only place currently where you have to use UHF is boss frames, because there seems to be a bug there which causes only the targeted boss' health to update if you use UH.
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