Thats a good drive, but get the black if you can afford it.
With retail, you get tech support and a few other goodies. For the full list visit ms site. With oem you just get the installation disc.
If your confident with installing, maintaining, troublshooting and fixing windows, or have a friend who will help, then get oem.
Most average users who buy oem, but have no clue on how to fix it, use google, so its worth getting oem.