I have also been flip-flopping on which hub to use. I had decided on the LX because of a few reported problems with the XT. But then I compared the seals.
The seals on the LX T660
http://techdocs.shimano.com/media/te...9830648102.pdf
do not look to be nearly as complex as the seals on the XT
http://techdocs.shimano.com/media/te...9830621050.pdf