There are several factors that make a good lcd- viewing angles (at what point contrast is 1/10 of what it is when viewed optimally), contrast, brightness, and response time. Response time is very important in games and multimedia in that if the lcd cannot switch fast enough to provide the necessary fps, it'll look blurry. Thus, the lower the response time the better, you can think of it as an inverse multiplicative relationship where xy=1000 milliseconds. Thus, 30ms response yields 33 1/3 fps, which at first appearance would seem fine. However, there is another added aspect to this- grey shift. The stated response times are for black to white, white to black only- ie applying maximum energy to change the crystal. However, in the case of intermediary colors, less energy is applied to attain the desired amount of light blockage, and it thus takes longer to shift. To give you an idea, and lcd with 25ms response time can have up to a 52ms response time one way when dealing with greys. Technologies that are especially prone to getting bad response times with gray shift are MVA and PVA. The new 16ms response time lcd's are ok though. In terms of the monitors you have monetioned- the 152T seems way too bright- 350cd/m^s is ridiculous. To give u an idea, the human eye is most comfortable at 40 cd/m^2, crt monitors have max of around 100 cd/m^2 (past that point energy consumption and what's emitted are too great). Thus, 350 will cause u some serious eyestrain. the X52 looks ok, though it too is really bright (300cd/m^2). Response time is ok, though could be better and viewing angles seem kinda inadequate. Same issues with the viewsonic. Finally, the sharp looks ok- 250 is still high but compared to the others..... Viewing angles r great- 170/170º! And response time is 25ms (you'll still get some blur though, be aware). Is there any chance you could go for a 17" LCD- when newer tech comes out it tends to focus on larger monitors first, the new 16ms 17" being a prime example of this.
Hilbert space is a big place.