The reason I chose the Z77, even with the i5-2500k, is so that iun the future you could pop an Ivy Bridge processor in there with a video card that may need PCI-E 3.0 bandwidth available.
For someone who is 10 I think this is a crazy amount of overkill.
I would seriously consider getting an i3-2100/2110, with a 7770 as the video card and 4GB of RAM instead. Stick with the Z77 though as the motherboard so that when he is 13 or so you can do a video/CPU/RAM upgrade so that he keeps up with the latest games at the time.
P.S. My 10 year old plays on an Athlon X3 with a 5770 and 4GB of RAM . . . I have yet to hear about them complaining of performance problems . . . The kids are more than happy to not have to share a machine with 'gamer Dad' who hogs it 24/7

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