buddy and I both have brand new 13" i7 1.8ghz 256 sad (samsung) airs. His is about 3 months old. Mine i got today. I didn't migrate any data and have used 20gb of space just between the base OS install and apps I have installed. His machine boots in almost 1/2 the time that mine does. mine has 1 more startup item than his. ideas? reasoning?