Just play an Dwarf Fighter (Unbreakable) if you want to resist spells better. Getting endurance, diehard, and steel soul at first level pretty much sets you up for being a very durable fighter. If that is not enough just take two traits for your will save and fort save.
With an array like:
STR 16, DEX 14, CON 14, INT 12, WIS 14, CHA 7
and saves like:
FORT +5, REF +2, WILL +3 (+4 Vs Spells and Spell-Like Abilities)
Plus with 12 INT you still have 5 skill points without having to cannibalize your wisdom score.
At 2nd level and every four their after an unbreakable fighter gets a +1 bonus to will saves up to a maximum of +5 at Level 18. At Level 20 they become immune to mind-affecting effects.