This will work:
http://www.ebay.com/itm/SMALLRIG-VersaFrame-Cage-Large-for-Canon-EOS-1DC-Canon-1DX-Nikon-D3X-D3S-1750-/252380527809
It works for 1DXII. Regarding monitor, I have SmallHD 501 but I guess SmallHD Focus would be better as it's much brighter.