I have an old Dell 30in LCD monitor/tv that is 720p It worked nice in 2005 when I bought it. But today the low resolution is really starting to show. There just isn't enough pixel real estate for multi-boxing or even loading up a handful of ui mods. Even websites get crammed and pushed off the sides now and those old slider bars start to show up on the bottom of pages like the old html frame days of the early 90's.

You will be better off with a smaller tv at a higher rez than a larger tv at a lower rez for the same price.