Hmm. It would still only boost my Will saves to +3 (+3 base-3+3) so it's not THAT helpful. Magic items aren't that expensive, I could probably pick up a ring that has +3 will saves on it for a couple of grand (should've done that before, but I wanted that elven chainmail :3). I'm not too enthused about the idea of multi-classing either since I'm neither Human nor a Wizard, so my XP would get all messed up.
Speaking of that I'm probably just going to go straight Barbarian with this character; Frenzied Berserker doesn't look like it's worth it. OK, yes, Supreme Cleave/Supreme Power Attack look awesome, but it's not worth ten levels to get SPA, and I want to get to 17 with Barbarian first for Tireless Rage before I worry about Supreme Cleave. Wait. Actually, Diehard at first level sounds pretty nice. I still need to get Destructive Rage and Intimidating Rage before I can take it, though. :\
*keeps reading*
Holy shit, Improved Power Attack gives +3 damage for every -1 to attack when used two-handed weapons? I usually use -3 so that's +9 instead of +6... Five levels might actually be worth it, especially since I can pick up Great Cleave sometime while leveling FB and basically become a tornado of destruction on the battlefield. :3 (Unlimited Cleaves per round from Great Cleave and the ability to take a five-foot step once while Cleaving from Supreme Cleave = many dead enemies.) Destructive Rage is kind of crap (ooh, +8 to strength to break things. I hardly ever Sunder anyway
) but Intimidating Rage looks awesome (pick a target within 30 feet and inflict them with Shaken? Nice). Instantaneous Rage is nice too (start Rage even during other people's turns, like before a spell hits me to take advantage of higher Con? Hell yeah :3).
EDIT: Checked the wiki and...
this. So hard. :3 It would make multi-classing worth it. I can see it now: Get intimidating rage at level 12, at level 14 multi-class into monk, then at 15 back into Barbarian and grab Destructive Rage, then prestige into Frenzied Berserker for five levels and pick up Ascetic Savage at 18 to make me a lvl 15 Monk and Barbarian (where it counts, namely unarmed damage and rage per day). If we go into epic levels, I'll probably end up as Barbarian 24/Monk 1/Frenzied Berserker 5. At level 21 I'd grab Improved Ascetic Savage (for moar speed), at 24 Great Cleave and Terrifying Rage, at 27 Improved Martial Arts for more damage (+7 damage, thereabout), at 28 probably Epic Prowess or Armor Skin, and at 30... hmm... Mollarok's Fist? Or Cunning Rage, that eliminates the -2 AC penalty... :3