For group theory, I love Nathan Carter's Visual Group Theory -- very example and picture based. Rather than treating groups abstractly from the beginning, it tr

For group theory, I love Nathan Carter's Visual Group Theory -- very example and picture based. Rather than treating groups abstractly from the beginning, it treats them as "groups of actions" which in my opinion is the best way to view the subject. For a more traditional, formal approach, Saracino's "Abstract Algebra: A First Course" is my favorite among this genre. I have also heard good things about Pinter's "A Book of Abstract Algebra", and it is available quite cheaply. I have not read it though. Good luck!