Can't make any recommendations unless you give some details about your requirements.
What audio connector do you need (RCA, Digital Coax, Optical)?
What video connector do you need (HDMI, DVI, VGA, Component, Composite, S-Video, RGB, etc.)?
Do you need DVD-ROM or DVD-RW or none?
What about the case, any height or width requirements?
Are you going to netboot, or do you want an HDD?
Will you be doing HD or just SD?