You didn't specify what type of projects you work on. Do you need big resolutions, or 720p is enough?
I ask this because you could get a lcd TV 720p (26",27",28") or even 1080p (there're many 32" 1080p LCDs) and use it as your monitor.
This way you could work and user the TV PIP (picture in picture) to check TV channels.
If you allready have a lcd you could use it as a second display.
I've wallmounted a 32" lcd and use it this way. I'm loving it
If you really want a computer LCD, for 500USD you can get a 22" or even a 24".
To connect to the PC you'll use a DVI connection. Many new models also have HDMI, but to use it, you'll need to have a "compatible" graphic card in your computer.