Glad to see that you have included Michelle Paver's Wolf Brother in new texts. I read this some months ago and was so taken with it I ordered two copies for our class library - it's on my 'must read to the class' next list.
We have just had our Scholastic book fair - and having ordered it for the week of SATs and with a combined year4/5 residential trip away for the week I thought we wouldn't do so well. We coined it in! and both my colleague and I are sure it's down to the POR effect. What particularly struck me again were the ambitious choices children were making. The 9+ range fairly flew from the shelves - and the children were talking most knowledgeably about a much wider range of authors.
My year 4 class routinely bring in books from the library to share with the rest of the class and a number of the boys are now heading off to the 'Young adults' section having got beyond Horrid Henry - their idol at the beginning of the year!