[Evnoir]

subin's post definitely helps.

I also want to point out that if you're going to display HD videos, stay away from clips that contain a lot of close-up shots of human faces. It's just a personal thing, but I find close up of faces and really deter some customers from buying it at times (such as dramas). Nature shows are always a good choice when it comes to vibrant macro shots.

Just aim for something with a wide array of bold colours, and if the TVs have high refresh rates, something with really quick action.