Spell recommendation

[CigarPete]

I need to decide on an 8th level spell. It is unlikely at this point that I will be able to get both as our magic mart has fled the city. Character is 20th level, Fighter 2/Evoker 5/Spellsword 5/Abjurant Champ 4/Custom full casting gishy prestige class 4, so one of my two needs to be an evocation spell. Currently in the spellbook as 8th are Mind Blank and Telekinetic Sphere. I am going to take Field of Icy Razors as my evocation, but am debating between Greater Prying Eyes and Moment of Prescience for my other 8th. Which would be better and why?

[elonin]

Moment of Prescience is a great spell. Count that as auto succeed at just about any roll once per casting.