There are 10 levels. Ten seems like a good number because that's how many fingers people usually have, and fingers are excellent!

arturo's hints of dimensions and honorifics caught my attention. How about leaving these ten XP based levels, and adding another dimension to them, one somehow based on reputation?

This could use a degree scale of 1 to 10 (what else :-) calculated dynamically by looking at the average reputation of all users above level 1. If the worst avg rep was 3 and the best 33 the scale would look like this:

1 - - - - - - - - 10 (degree)

3 - - - - - - - - 33 (average rep)
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Now imagine an extreme example of a friar with avg rep of 33 and a saint with avg rep of 3 illustrated by ranking them as a 10th degree Friar and 1st degree Saint. This would tell you something useful. Since both the degree scale and each user's avg rep vary, they could change in interesting ways.

Update: MeowChow suggested in cb that avg rep might not be the best measure. Maybe total reputation would be more accurate? I don't know. I'm just suggesting another dimension somehow based on reputation. The rest is details.