Vox Political in fact published this information (with only slightly varied figures – £605 pw instead of £670/£612 – in May: http://voxpoliticalonline.com/2013/05/25/dwp-denial-with-prejudice/
However, it is information that bears repeated exposure to the public because – as Johnny Void points out here, and I pointed out before – the benefit cap is indeed based on nothing more than a bare-faced lie.