If this is going to be really quite then Pentium M 755 (Dothan) + DFI 855GME-MGF, I'm building one soon. The thing doesn't even need a fan, and it does come with one but it never runs adn if it does then it is 250 rpm so you can't here it either way.
The BenQ happens to be bigger and cheaper, but I would trust Viewsonic more, I have that exact same one and I love it, but the BenQ is still pretty dern good.
Cool, but I would really like a full tower, or, mid tower black case with acrylic windows and no door. And will this system be quiet? I need a silent system.