I installed a 23" Samsung HDTV/Monitor in my saloon opposite the settee. The TV was about $220 from NewEgg.com, an excellent source for computer and consumer electronic stuff.
I installed it using a Rosewill model RMS-MT2790 mount, from the same source, around $25. The mount is removable, with a piece that goes on the back of the TV that slides into and lifts out of the piece that mounts to the cabin side. The mount is aluminum castings, and I replaced the screws and stuff with stainless hardware to marinize it. I bought some extra mounts: I can move the TV to the dinette so that I can use it as a monitor, and I could also put a mount in the forepeak.
I installed a powered antenna also, a Rosewill RMS-HDA5000. It is small and mounts to the bimini frame. Also Newegg, $25. I like to see the live radar weather, but I don't much care about the other 25+ channels. I have a blueray player and I rent movies a lot.
For travel I take the TV down and leave it face down on a cushion. It's easy to put it back.
The 23" size is pretty good for viewing from 7 feet away, across the saloon, and I am not sure that a larger one would be worth the effort. I can only use it at the dock, since I do not have an inverter, but a true sine wave unit for the required 100 watts is cheap. If I were doing it today, I would get a model with LED backlighting since they draw less power.
1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida