So here's my situation: I have a 2.0 GHz Alu Macbook that has a loose battery door and loose black piece that surrounds the hinge of the screen. So I'm planning on taking it in to get exchanged (I've already been told that they battery door issue would be reasonable enough to warrant an exchange if I want it by a Genius). So here's where the questions come in... 1) Could I exchange my 2.0 Alu Macbook for a 2.4 Alu Macbook by just paying the difference? 2) Can I exchange my macbook for a Refurbished 2.4 Alu Macbook by paying the difference? (Essentially trying to lower the cost of exchanging) 3) Can I exchange my macbook for a 15" 2.4 Alu Macbook Pro by paying the difference? 4) Can I exchange my macbook for a Refurbished 15" 2.4 Alu Macbook Pro by paying the difference? I realize that a lot of people might not have tried this before or know the answer, but just looking for some thoughts on my idea. I'm hoping to get a better processor as that's something that can't be changed over time. Thanks for all the help and input in advance.