Grumbling HD will likely be fixed, just ask them to replace it with different drive. As for the display, it's up to you. Out of 3 686 400 pixels, it's not a surprise that one or two aren't working. Keep in mind that the replacement might have e.g. yellowing and even more defective pixels. I've lived with mine, I tried to get a perfect iMac, but I gave up and haven't regretted. I might ask a replacement LCD soon anyway due image persistence
Well, if a replacement is worse (more yellow, more dead pixels), then I'd be in the same spot I am now, wouldn't I? I'd still need to do either a replacement or repair at that time.
If I do a repair, can they fix the dead pixels by replacing the screen panel or something?