Helm of Paranoia
[Major Wondrous Item] (BilltheCynic)
This helm resembles a homemade hat of tin foil, but is far more sturdy and structured.

Wearing this helm gives you a +10 competence bonus on Sense Motive checks and a continual Mind Blank effect. In addition, you may expend an immediate action once per day to gain a +15 bonus to either one saving throw of your choice, or your AC until the end of the round.

Strong Abjuration; CL 15; Craft Wondrous Item; Mind Blank, Moment of Prescience; Price 145,000 gp.

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The price should be even higher according to the formula for making a magic item, but it seemed overpriced to me, so I knocked it down a bit. Still ridiculously expensive, but not "more expensive than any non-epic and non-Mirror-of-Life-Trapping wondrous items on the SRD" expensive anymore.