I really liked Sarah's Unicorn by Bruce and Katherine Coville. I don't know what attracted me to it, I think it was the story in combination of the artwork that drew me in and it's been stuck with me ever since. Though the funny thing? We don't even own it, at the time we kept borrowing it from the library as kids, but we didn't even have a copy. Not even now. This needs to be redeemed, methinks. Although I don't think it's on the market anymore?
I also read the Goosebumps series by R.L. Stine quite a bit, too. But I think everyone did. Heh.