Ill do a ton of photo editing and video downloads and edits. School work such as iWork, Lightroom and other apps. Should I wait for the update for the air in 2013 summer or get the new iMac 21.5in with 16gb ram? I don't want to spend anything over 1500$. I also want my computer to last 5+ years, which one should I choose? I take a ton of photos and edit them. About a 1000 a week