Hi, I'd like to know what the difference between the optional "2.8GHz Quad-Core Intel Core i7 processor" in the new 27" iMac and the "2.66GHz Quad-Core Intel Xeon "Nehalem" processor" in the Mac Pro from early 2009 is? I am confused about whether or not they are the same type of processor (or if i7 is slower and therefore the 2.8 i7 will be slower than the 2.66 processor in the Mac Pro?) Could someone clarify this for me please? Also, two other questions: 1) does anyone use an imac with a matte film on top of the screen? does it work well? does it look like a "regular" matte display or does it look weirdly grainy? 2) would the new imac (27", i7 2.8 GHz, 8GB RAM) be powerful enough for lag-free video editing (1080p footage from Canon 5D Mark II) or is it better to go with a Mac Pro? (note: I am no professional, I am a graphic design student doing mainly photography and wanting to get more into film) I hope you guys can help me thanks, chris.