I always use slower leveling mods for Beth games since I prefer to take my time to explore or develop non combat skills too; I look for mods that usualy require 50% or 100% more xp or skill points to level up.
I have the GOTY edition so my cap would be 30 but I want to really a few suggestions on this, because I have read that some mods have wrong forumlas for the xp advancement, so in the end you need less experience to max level.
I plan to start installing mods and preparing my new playthough for the weekend so suggestions are more than welcome!