I don't think that the resolution of your screen will determine whether you get jaggies or not... I use both a LG
(at 1600x1200) and a Samsung 17" (at 1280x1024).
If you are viewing the photo at 100% zoom, then you won't have visible jaggies, unless you have accidentally over-sharpened the photo. If you alter the zoom of the picture, then it can display
jaggies, but they won't actually exist on the photo at 100%, just displayed on your screen.
I am not here to change the way the screeners work, but if you have the same photo at 1600 and 1280 pixels wide, you will have a lot more detail on the 1600 one, and therefore any flaws in the photograph will be more noticeable... So, a photo at 1600 pixels wide may be rejected, but the same at 1280 may well be accepted.
A306, A313, A319, A320, A321, A332, A343, A345, A346 A388, AC90, B06, B722, B732, B733, B735, B738, B744, B762, B772, B7