First things first, I'm fairly new to the video, so please excuse basic errors I may make 
I'm looking for a field monitor for my 1DXII that would help me with focusing on fast moving subjects - aka birds in flight.
At the moment, I manually focus my lens but the camera screen is to small to judge if the subject is in focus. I believe that focus peaking would solve this issue for me. Correct?
Can anyone recommend a good monitor that has focus peaking and would work with a 1DXII? Monitor with a touch screen that would work with 1DXII's autofocus would be even better 
I'm looking for something below $500 but can stretch it a little if needed.
Also, is there an option of using an iPhone as a field camera with a DSLR? Quick google search found that there is an app but it requires a jailbroken iPad. Anything for an iPhone without JB?

