When I was in the market for a small low-power home server, I actually found the NUC's to be overpriced and under-performing.

There's no i7 option, and they will run you about the same base price as an Gigabyte Brix which does offer i7 and/or i5's with more powerful graphics (and AMD APU options for very nice graphics if required).

My home server did not require much graphics of course, but the i7 quad core is very much so a nice-to-have.

Even a Zotac Zbox with an i5 will get you more bang-for-the-buck since they are about $50-$100 cheaper, and come with more peripherals (like dual Gigabit ethernet ports).