Platinum or no???

[want-a-fast-svx]

I have searched through many of the archives and still can't find a specific answer. I have the engine out of my car and am in the process of replacing it. I would like to know if I should run the iridium plugs only or if the platinum 4's are the way to go???Is there any benefit to the iridiums???I went to the parts store and they didnt even know what iridium was... Thanks for any help...