The 16GB NOOBS SD Card (including MicroSD card to SD Card Adapter) means he can plug and go without the issue of installing the OS on the card.
I use the case, myself, and it protects the Pi, but the transparent lid unclips easily to allow Pi HATs to be plugged in. I drilled a small hole to allow for the SenseHAT push-button to poke through and I can keep the lid on and see the 16 x 16 display working. Unclipping the lid gives fast access to the GPIO pins. Oh, and it looks cool, which may be important to him.
The official case also provides an access panel, but it is not transparent (and it's pink!).
Check that you cannot get the parts of the kit for less money.
Let him explore from this starting point and he will decide for himself if he wants to stream media or control nuclear power stations.
If you live in the UK Maplin sell a reasonably price, £50, starter set for the rpi2 which comes with a keyboard, mouse, wifi dongle and usb hub along with a noobs sd card. A lot of online retailers have a Raspi starter set, including Rapid online, adafruit, sparkfun, all of whom give you a reasonable price and as long as you go for a reputable retailer you won't have any trouble - i.e stay away from cheap eBay lots.
Main things to look for in a starter set is a keyboard, mouse and an SD card of at least 8Gb. If he is interested in the electronics side, look for ones which come with a large breadboard along with the ribbon cable and breadboard adapter, some will even come with basic components.
I agree with C-3P0, I would recommend the official Raspberry pi user guide from the raspi foundation, as well as Simon monks book ( cant remember the title), and there is another called Raspberry pi projects, I cant remember the author. If he isn't a fan off books, there are a million tutorials online.
Speaking of literature... I would recommend this Humble Book Bundle. It's not the first one they made about Raspberry Pi / Arduino (and hopefully not the last).
It is a time limited event - only six days remaining.
Absolutely the PI3 Model B. It is basically the top of the line in the PIs and without the complexities of the compute unit on separate boards.
Everything works right out of the box as they say. Just be sure to get a 5V 2.5A supply with it (The official PI power adapter is perfect), this allows for add on devices without worry of low voltages causing you issues.
