What is the difference between the 24" base model with the upgraded processor, memory, and hard drive to the top of the line 24" model. From what I can see, they both cost $2299 and there is no difference between them. Which makes me wonder why they even have the top of the line model. I am planning on buying a new 24", but honestly I was hoping for more with the new case. It just seems to be the same thing but new material. I"ll be checking it out in person this weekend at the Apple store. Hopefully I'm more impressed then.