Hey, I was wondering if there's any reason not to get a 1.83 cd mini (not c2d!) if I can get it for under $400? It would only have 512 mb ram - so it would need an upgrade. That would add another $100 to the price (if I have an Apple certified tech do the upgrade). But is there going to be a significant difference in speed/performance between the 1.83 cd and the newer c2d models? Also, can the memory be upgraded by an Apple tech without voiding the warranty? One Apple rep told me one thing, and another one told me the opposite . . . . For $200 more (if I've done my math right) - or actually only $100 more after adding in the cost of the upgrade! - I could instead get the 1.83 c2d with the same memory upgrade built in. So, the newer processor, but combo drive instead of super drive. Is it worth spending the extra $100? I'm using it primarily for text editing & internet research - so nothing graphic intensive . . . but the G4 mini I'm using now is dragging its a$$!!! Also, I could do this cheaper if I did the memory upgrade myself, or had someone other than an apple certified tech do it (yes, I do know what a pain it is to open these!) - is it such a big deal if I do that and lose my warranty? Thanks in advance!!!