Right now I have a MacBook Air 11.6" and I'm looking to add an 27" iMac for more intensive work such as video editing and photo work. I'm debating whether to spec one with the 256SSD+2TB HDD or to just get one with the 256SSD and then use an external HDD that can be accessed by my MacBook Air also. Getting the 256SSD+2TB HDD would probably be cheaper and more space efficient not having to deal with another whole piece of equipment. The advantage of getting an external would be that the iMac wouldn't have to be on for my MacBook Air or any media extenders to access music and videos stored on the external.