I am planning on buying a new mac pro and It seem to me that apple gouges you on memory and hard drives, so if I add my own memory what brand do you suggest (and where to get it) and what kind of hard drives does apple use in it's Mac Pros and where can I get them? Or are there better drive that are cheaper? Or maybe and external raid for DV Editing? Why pay $400 for 500gb when I can buy them all day long for less than $200? Thanks in advance.