As a favor to a friend, I do video for mixed martial arts events. My friend that puts on the shows would like to add an instant replay feature to show the highlights of the previous round in between rounds and after the match. He is looking for something simple, like the instant replay feature found on his DISH dvr. He event got a cheap TIVO but it wouldn't accept the camera's input. The video is run to a distribution amp and viewed on four 50 inch LCD tvs.

I am looking for a set top box, like a pvr/dvr that will take the composite imputs from my camera and allow instant replay of the live video, and be able to go back to the live video instantly with the push of a button. We would like to avoid the use of a software solution because the operator will likey be a novice with no real time to train. The simpler the better. We are looking for an inexpensive solution, in the hundreds of dollars rather than thousands.

I've looked quite a bit but have been surprised I haven't found many solutions yet. Any suggestions would be greatly appreciated.