The only cards I would ask to be slabbed Authentic are printing plates, since they grade so low on Surface. Then again, I don't get any of my cards graded, so it's a moo point.
Joey's Moo Point! - YouTube
My Sketch Card Collection: http://www.sketchcollectors.com/gallery.php?user_id=39
I am a network admin. If you see me laughing, pray you have a recent backup.