The prices you got are solid and through an authorized dealer (granted he's breaking contracts selling that cheap) Even if you find the stuff a little cheaper you will have hassles with warranty claims because neither Jl or focal allow online dealers with respect to crutchfield.
For your question on the tweeters the pillars are more optimal then the factory location. It helps raise the sound stage and the harshness of imaging the tweeters off of glass. Id recommend going with the 9887. It will give you more tuning options to help dial in your front stage.
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