Firstly good choice on the TFT.
Right responce time is better as low as you can, I got a 8ms (millisecond or 0.001) responce time which is not too bad, dont go for a 20ms or higher one as your image will suffer for it.
The dot pitch depends on the size of your monitor you are going to buy, normally the lower means the better as there would be more pixels displaying your image.
Another thing to watch out for is the viewing angle, mine is 160 degrees horazontal and vertical, this will affect how use ful your screen is.
The input, DVI vs VGA. DVI is digital video interface, and only the newer graphics cards would have them, so depending on your machine I would look for one with a VGA interfaces.
Hope this helps, any otehr problems just