I actually like the Forsaker. The only feature tied to the magic item destruction is its damage reduction, and there are lots of other sources for that, including Vow of Poverty, which every good Forsaker should have. Also, if flaws are allowed, characters can start as Forsakers at level 1.

Now, for a class I really don't like, I will mention the Solar Channeler from the Shattered Gates of Slaughtergarde. The easiest entry is with a level 6 Cleric. It loses three caster levels, and its titular feature allows you to spend a Turn Undead attempt to turn into a Solar for up to one minute per attempt.

While in Solar form you gain a fly speed and the ability to fight in melee almost as well as if you had cast Divine Power. In exchange you temporarily lose access to all of your magic items and the ability to cast spells.