Dorena, Wonder does sound good! I'd noticed the cover but never flipped through it. Amazon readers agree with you--it's rated 4.8 out of 5 stars, one of the highest ratings I've seen.
I think I'll read it myself before deciding if I'll suggest it to my 8 year old. He's a very good reader, but also extra sensitive. It might be a good choice for him as he also struggles with differentness and acceptance. Not with deformities, but more typical things like wearing glasses and some less-common interests.