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Napa is good stuff. I would only go for the best if they don't cost much more. Your bearings get a lot of abuse from 4x4ing. Foreign matter will destroy the best bearings as well as good bearings.
I had a 14BFF that would leak with anything but GM seals. I've run nationals in my other 14BFF with no problems though. If you have the time, I would order the GM seals.