Bom como dito em seu otro post seu limite e de R$900, intao a melhor opçao seria
Placa Mãe Ecs A780gm-a Black Edition + 229,00
URLaHR0cDovL3Byb2R1dG8ubWVyY2Fkb2xpdnJlLmNvbS5ici9NTEItOTkxNjgyMzItcGxhY2EtbWUtZWNzLWE3ODBnbS1hLWJsYWNrLWVkaXRpb24tYW0yLWhkbWktZHgxMC1yYWlkLWF0aS1fSk0=
Processador Amd Athlon 64 X2 7750 Black Edition 2.7ghz - 178,00
URLaHR0cDovL3Byb2R1dG8ubWVyY2Fkb2xpdnJlLmNvbS5ici9NTEItOTg2NzkyMzItcHJvY2Vzc2Fkb3ItYW1kLWF0aGxvbi02NC14Mi03NzUwLWJsYWNrLWVkaXRpb24tMjdnaHotYm94LV9KTQ==
Memoria Corsair Ddr2 Dominator 2 X 1gb 1066mhz - 168,00
URLaHR0cDovL3Byb2R1dG8ubWVyY2Fkb2xpdnJlLmNvbS5ici9NTEItOTg5NTYwODYtX0pN
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Memoria Corsair Ddr2 Xms2 2x2 gb 800 Mhz - 162,00
URLaHR0cDovL3Byb2R1dG8ubWVyY2Fkb2xpdnJlLmNvbS5ici9NTEItMTAwNjExODQ1LW1lbW9yaWEtY29yc2Fpci14bXMyLWRkcjItODAwLXBjNjQwMC1raXQtZHVhbC1jaGFubmVsLTRnYi1uZi1fSk0=
Fonte 450w Reais Extream - 172,00
URLaHR0cDovL3Byb2R1dG8ubWVyY2Fkb2xpdnJlLmNvbS5ici9NTEItMTAwNTA1ODE1LWZvbnRlLTQ1MHctcmVhaXMtZXh0cmVhbS1wY2ktZS1hdHgtMTJ2LXZlcnNvLTIyLWdwb3dlci1fSk0=
Total.............................R$ R$ 747,00
Da pra vc compra o hd mais vai estorar um pouco o orçamento.