I had the same problem. My version is 32GB 4G black model. First time around I noticed like one dust particle in the right corner. It was bright white when sun refected on the screen and like a black dot when you where using it with only your black light. I also noticed my camera had really bad backlight bleeding at the top of the screen. I returned mine to my apple store and they replaced it with a new one. Problem is this one had even MORE f-ing dustparticles. All. Over. The Screen. So I replaced it AGAIN and this time, there were two dust particles on the screen, one in the lower right and one on kind of in the middle. But, It dont show when you are surfing. It only shows at certain angles when bright light shines on the screen. So Im not gonna take any more risk, Im gonna stay with this one because I really need to have the ipad directly under a lamp to see it and it reflects poorly.
So if it's just shown when you have sunlight on the screen I would suggest keeping it because it's not worth all the trouble. All tought I do agree, it's a lot of money and they really should fix it!!
Oh, my backlight was fine with the third replacement I got.