I will only use the camera for stills.I have several CF cards and it is always best to have cards dedicated to each body. I have three bodies (when my Mark II arrives I will still have three as I keep the two latest, my 40D goes to wife, her 30D goes to son, his 20D goes to daughter, etc.) and will have at least two sets of new cards, CF and SD. I haven't decided on size yet, though I expect I will use 32 gig UDMA-7 and UHS-1 cards....unless someone on here can convince me otherwise.
Will you both have a CF and a SD card, and if so which are you planning to use. I have several CF cards for my 1Dx, but I would like dedicated cards for the new 7DII.