Want to upgrade to whole house DVR, but have some questions. Present config is: HD H24-700 HD H24-700 HD-DVR HR22-100 HD-DVR HR21-100 DVR DIRECTV R15-100 Have a zinwell 6x8 switch, so all my outputs are taken. I also will be adding another HD receiver to this very soon. With the 6x8 I can't do it. What will be needed to upgrade to whole house DVR and to also add an additional reciever? Thanks!