At a guess you want an i5 750, 4gb of 1333mhz ram, m-atx board of your choice and the Antec mini p180 with a corsair h50. Basically copy the arrangement Hotwired has done, the Antec is beautifully designed and as quiet as a case can be. PSU is dictated by the graphics card, which is dictated by how much you care about games.
That would be meHotwired? Who that?