This is one of my favorite lists of best books. 90% of what I've bought based on these recommendations have flown off the shelves. Their also some of my favorite books for book talks because I enjoy reading them while preparing the book talk!
This is actually NOT one of the awards lists that I use for collection development anymore. Like many other librarians I've spoken to, I found that the list peaked with "How I Live Now", and hasn't had a book on it that was popular with teenagers since. I think that they have taken their goal of awarding books of literary excellence in the wrong direction, going for obscure and hard to read books.
This page has a list of the YALSA awards lists. I don't use all of them (I've added separate bookmarks for my favorites), but I'm sure there are some on the list you'll need that I don't use.
These are good lists based on what teens recommend. You may find that you already have many of them in your library before they come out on this list, but there may be a few here that are new to you and deserve consideration. The list is also a great source of titles to use in booktalks.