So what you think of this?

[Astro]

board: M3A78-EM
cpu: AMD X2 7750 Black Edition (com multiplicador desbloqueado)
graphic: ASUS EAH 4870 1GB DDR5 com cooler Dark Night
mem: OCZ Gold 2x2GB
HDD: Samsung Spin 320 SATA II 16MB 7200Rpm
Tower: AKASA ZEN black com 2 fan 120mm ultra silenciosas da akasa também.
Power Source: OCZ StealthXStream 500W

?

[Sakumo]

Looks good. But I thought the Asus EMs are for HTPC, also if you can get a Corsair or PC Power and Cooling PSU, get those instead, they offer a huge amount of amps on one rail instead of multiple small ones, so you don't have to measure if your rail has enough amps to power your parts.