You didn't mention the size of the new TV you will be getting. But with my experience of testing on a big 50", I can say don't do it, stick with monitors.

You will need the 1080p, even large text looks blocky on a 720p. And even with the higher resolution you will spend hours tweaking the settings and magnification trying to get it to look good reading small text. Even then its never going to be as good as a monitor.

TVs also do things like blur the edges and stuff to make TV look better, you have to make sure the one you buy also has a PC setting.