Photographic Monitor Recommendations

Not a monitor for the PC to use for editing as I already have one of those, but a small one that I can hook to the HDMI output of my Canon 7D for viewing as I shoot.

For example this time of year I do Santa/child photos for a local charity. I shoot maybe 4-10 frames and let the parents pick the one they like. Using the camera’s display is difficult due to the small size.

I’m thinking a 7" or so display set on a light stand would be great. There are many on Amazon but I’d like input from any who are using these units.

http://www.amazon.com/Sourcingbay-Inch-Monitor-800x480-Built-/dp/B013OOJUVI/ref=sr_1_9?ie=UTF8&qid=1450883504&sr=8-9&keywords=7%22+lcd+monitor

http://www.amazon.com/BacchaBox%C2%AE-Inch-Monitor-Composite-Inputs/dp/B00V7FUDFY/ref=sr_1_11?ie=UTF8&qid=1450883547&sr=8-11&keywords=7%22+lcd+monitor

http://www.amazon.com/PLHR77-Screen-Monitor-Headrest-Universal/dp/B0034G3XIS/ref=sr_1_20?ie=UTF8&qid=1450883670&sr=8-20&keywords=7%22+lcd+monitor

I’m not limiting myself to these particular units, these are just examples of what I’m interested in.

Advice welcome.