Looking to buy a mac mini for my mom...she only needs it to watch online videos so upgrades are not a concern. Was thinking about purchasing from refurb on apple site (have always gotten good deals on refurbs). My question: Do the refurb model prices typically go down when a new model comes out? The reason I ask is in case a new model is introduced at WWDC I was hoping I could get it under $400. Thanks in advance for any insight.