I read Prey, which turned out to be a very good book, but it did ruin the read of the Avp movie novel as you will notice how close the basic story is drawn from prey. I've have War but have never read because Hunter's Planet was out of stock on amazon.co.uk, and it still is I think, so what would be the point of skipping a book.
I waited 2 months for Hunters Planet, nearly 2 years ago now. Annoyed me like hell.