I recently bought one of those large Korean monitors (2560x1440). Even with 90 degree notation, I can easily fit two columns of code on screen (well, there is space for two columns, no IDE actually does this)
This is my second one. Haven't had any problems. The one I'm using now is Crossover 27QD-P. I bought it because it pivots, ironically it doesn't work when pivoted on my older model macbook pro. However, it worked perfectly on a similar (slightly newer) macbook pro so the problem seems to be with my laptop. Make sure you have the correct connectors, I had a buy a displayport-dual-linkdvi adapter from monoprice.
