Quote from opt789:
There are no great 30" monitors out there right now, but the one you are looking at is good for the price. It has an LG S-IPS screen so you get good viewing angles, but is has sort of a sparkly appearance which some people do not like. It does not have true color accuracy, a good scaler, and it will have some backlight uniformity issues, but you probably don't care about that for trading.
All 30" monitors need a really good video card to take advantage of the native resolution (and there is no reason to buy a 30" unless you run it that way) and the dot pitch is small so you will probably want to increase the dpi to make it easier to read.
Also, as far as I know all 30" monitors get hot, I mean hot enough that you will notice it so you will want a fan or good air conditioning. You should also count on spending a couple hundred on a calibrator to get the monitor looking correct.
I have 2 30" NEC; there is no such thing as too big.