After configuring it with some basic components it is in the same price range as the high end mini. Makes it look like there is no Apple tax.
Nope. Go to Newegg and build it. It's a lot less, in the $600-$650 range depending on if you want SSD or hard drive. Besides, the NUC also has an i7 Kaby Lake dual-core processor. The Mac Mini has Haswell, three generations behind.