Monitor displays the output of your work in visual form.

So choosing of Monitor is typical because what you have done in graphics application exactly same should be displayed. And also for playback in video and games screen plays effective role. Screen should be able to perform as to achieve real, comfortable to eye and customizable working environment.

In choosing of monitor following basic point should kept in mind: -

To get full feature of your video card in your PC, monitor should be capable.means what video card can produce atleast same can be displayed by screen.
In technically the max resolution of monitor on max refresh rate, non-interlace feature of monitor, dot pitch of screen (less dot pitch means Flatter screen), anti glare coating on screen, for customization of output on screen, Controls of monitor are main point to consider when you are choosing your monitor.
The screen size like 14" 15" or more you can decide according to your need and budget.like for more flatter screen, working in graphics application to achieve high quality and depth picture, for better control option, for get auto support of all latest game and movie and other graphics things.
The big screen is better according to your need and how much you can spend with a smile.

Because now a days a lot of Monitor with latest facility is available. But you can get max feature in affordable money if you spend a little bit of your time and skill in selecting good monitor as your need.

The technical points to compare in choosing monitor are: Max Resolution supported by monitor.
Max refresh rate on max resolution.

Dot pitch of CRT of monitor.

Is it Interlaced or non-interlaced, non-interlaced is better.

How much control is available for controlling the screen customization is it analogic or digital or onscreen digital. On screen digital control is better now a days easily available.