So I'd be very grateful if anyone can give me their opinion on these two authors and what they would consider each ones greatest work. I'm hoping that I just happened to start off on books that weren't the authors' bests.
(I'm hesitant to list the two books that I've already read so as not to discourage any posters that thinks they are the best the author has to offer. Thanks to anyone that can help!)
ETA: I've been reading the comments and I have to give a big THANK YOU to all of you. I'll probably be dropping by the bookstore this weekend so thanks for all of the help. :)