I'm voting for Joshua ‘The Gamemaker’ from the United States because:
A. He already bought a motherboard, which shows he's going to invest in his computer.
B. The suggested upgrade includes a nice case which would make his computer look great.
If I could I would also vote for Joel ‘Ol' Unfaithful’ from Australia because his computer doesn't always boot (maybe it's the motherboard, maybe it's the PSU or maybe it's the power button) and for HAL ‘Dignified Potato Masher’ from Australia because of his DIY case, but unfortunately I can only vote once.
Good luck everyone.