I understand where you are at the moment; had a tough time picking a monitor some time ago.
I'm no monitor expert but from the looks of your GPU, that 7970 will be able run every game extremely smoothly at 1080p. So, hardware is no obstacle. One up will be 2560 x 1600 and those 30 inch monitors aren't cheap.
Since you don't care for 3D, forget it. It wouldn't make much sense to consider it and you get to save money.
Also to look out, there are many gimmicks when it comes to manufacturers selling their units. Things like speakers and HDR are more of gimmicks than anything else. The most important thing for you (a gamer I take it) is good reaction time and good colour reproduction.
While the LG model is tempting, I would go for the Asus VH236H. Almost got that once.
But with your budget, have you tried looking at Dell's unit. I hear they are really good.
Do note, 24 inch also runs 1080p. I personally prefer that size.