Don't know that much about the other models you listed but I own a Samsung 940BF. It was worth the extra cost to me over the 930 models. I haven't noticed any ghosting in high speed games and the color reproduction is really nice. Brightness is there too, had to cut it in half when I got it, overall I am extremely happy with it.
If there was anything "negative" I could say is that you can't raise or lower its height but its almost perfect for me on my desk so I don't really need it. Ergonomics are good, almost no glare with it either and I have many windows in my room. Had it about 9 months and no issues, oh one pixel, wouldn't call it dead. It is sometimes working 100% and other times won't display all colors. Its off to the left upper corner and I never noticed until I ran a program specifically to find such things. I have to really hunt for it now even though I know where it is. Not a problem. Movies look great too btw, watch lots of movies and gaming.