Okay, I'm set on getting a DS213j or better.
DS213j + 2x 3TB WD Red hard drives comes in at £409.97
but if I go for the DS213 with 2x 3TB hard drives preinstalled, it comes in at £429.95.
So for £20 more, I'm getting a NAS with better features but I have no idea what hard drives they come with, I'm guessing either WD Red or Seagate's NAS drive line up, if that's the case then is it worth spending £20 more?