This is not a guide to force you in trying these mods, but only to help you perhaps deciding which ones to try.
Shadow Magic is my favorite and thus the #1 mod out of every mod that I've ever installed. Number uno without a doubt; followed closely by Tome and Blood, Scales of Balance, Might and Guile, and finally Deities of Faerun.
Other runner ups and very close contenders are: Animal Companions, Undead Kitpack, Bardic Wonders, The Artisans's Kitpack (including Pale Master, Arcane Archer, Divine Champion, Hivemaster, Warlock), CDTweaks (Anthology), House Tweaks and Rules.
Other mentions include: "Militia Officer, Mercenary".