I am looking to buy a monitor for my 5D3 for shooting video. Needed for focusing mostly. I am shooting indoor performances and am usually at 200-300mm. I would like to buy a monitor to mount beside or on the camera. $300 max price for me. I see some have focus peaking and false colors. All of this is new to me, but they seem to be valuable features. Suggestions on brand and model number? Also, consider batteries. I have the 5D3 and 7D so the LP-6 batteries would be an extra bonus. Thanks!