What's the difference between Holy Grails and the To-buy list? No offense, but I mean the MU line can hardly be considered as grails of any kind except maybe a few figures in the line.
IMO Holy Grail is something either totally out of your price range or something very rare to find (most likely discontinued). Anyways mine is the Mighty Morphin Power Rangers Megazord and Dragonzord in minty condition with box