I"m looking at my first Mac purchase in the next few days and trying to decide if the MBA 13 is still a good buy.  I plan to upgrade to the I7, 8GB, and 512GB.   My use is personal and work from home using Parallel or Fusion.  I'm moving from a Toshiba 17" laptop the size of a small ship.   In the Apple Store, the MBA 13 looks like it would do the job, but I'm concerned about screen size and website readability.  It appears that when visiting a website they stay...