Papazian's book is a great read for a new brewer to get over the trepidation of brewing for the first time. It's also good at making the case that you should enjoy brewing and not agonize over what you don't know or over your mistakes. That said, if you've been brewing for a year and a half it might not have a lot of new information for you and you've probably overcome whatever fear you might have had as a brewer your first few batches.
Palmer's book is a lot more technical and a good read for new to intermediate brewers.