"Price Cut" (the price is now, right) or "New Game Releases" (I need this game, gotta get the box)
+
"Hardware Redesign" (rebuy) or "Bundles/Game Pack-ins" (im a collector type of person)
^ this is what sells hardware imo.
"What Gives You The Greatest Motivation To Buy A New Console?"
I think the biggest one is the "new Game releases".