I've been hemming and hawing at this for awhile now. For all you Power Users out there - is the 4GB good enough for you as a daily workhorse. Been looking for a lighter alternative to my MBP 8GB loaded... I run multiple windows, VMWARE, etc. The 8GB DOES make a difference in workflow for me. I also run into situations where I do need to hardwire via RJ45. So making sure than USB-ethernet is always on me is another *added thing* I need to make sure I have on me at any given time.