I like Prairie Lights since it is one of the best non-chain bookstores around. Great selection of books and like a real bookstore, crammed all the way up to the ceiling. The staff is great, willing to order any book you want and famous for the odds and ends answers to what may seem like Trivia Pursuit questions to some, but are important matters to a book lover.
You will find someone that can help you with whatever question you have related to reading and books.
I also like their author nights.