Currently I have a first gen 13" Macbook and I am about ready to replace it. The Battery is completely DEAD, space bar is broken and the rest of the keyboard is hurting, it only has a 40G HD and its about 3 years old. I do enjoy its size and portability. Thinking about stepping up to a 15" Pro. I'm just not sure I NEED all of that computer, so I'll ask a few Q's... Thanks in advance for helping a n00b. I don't do video editing or anything that really requires MAJOR computing power, I do photo edit as a hobby so I will run CS4. I do want a MASSIVE HDD because I am a History Teacher and I want most of my video clips I use on the HDD and not on an external unit. So the 320GB drive is a must. 1)Is the uni-body significantly better than the older case? 2)Is the 2.66 worth the $$$ over the 2.4? 3)I have seen some refurb units with the 2.5 or 2.53. Anything wrong with those chips? 4)Do I even need a MBP or will a properly equipped 13" unit do the job? Other advantages of the 15" I don't know about? 5)Other Advice? Thanks in advance for answering all my questions. I just don't want to drop this kind of cash without some educated answers/opinions.