If you were to start from scratch, this shit would get very expensive.

$349.99 (console, 20GB hdd)
$49.99 (Xbox Live subscription)

optional
$49.99 (upgraded headset)
$24.99 (cooling stand)
$19.99 (charge and play battery kit)
$99.99 (wireless adapter)
$49.99 (2nd controller)
$4.99 (3rd party HDMI cable)