When buying monitors, it's easiest to compare which one is better if you have them side by side with the same image displayed on the screen. I myself have a 900NF. When i bought it, i compared it to the PF790,E400, and the G400. The 900NF and the G400 look really similar. But the colours on the G400 are a bit more vibrant. The colours on the PF790 looked kind of washed out to me. And the text looked sharper on the 900NF than on the E400. The G400 has better image quality than the 900NF however i don't think the added cost is justified in the difference in quality. I would recommend you go with the 900NF.