Well 1600x900 is quite a downgrade from 1920x1200. 1600x900 = 1,440,000 pixels while 1920x1200 = 2,304,000 pixels. That said 1920x1200 is excessively high for a 17" display. On desktops 1920x1200 monitors start at 24" and 1600x900 monitors are all 20". So while the resolution on your display will be considerably lower the resolution is still well above the norm for that particular size. I'm not sure how much real difference the change will make on such a small display to the human eye. Perhaps go to a local store that sells laptops and has them on display. Try to find one you can check out with 1600x900 17" display to see if it will make a real difference to you personally.