If you're comfortable with charts, I find that a lot of the Pierrot patterns are nice.
Some paid patterns I like: 1 2 3 4 5.
I've also been loving Crochet Me: Designs for the Crochet Revolution, Custom Crocheted Sweaters, and Positively Crochet lately. I find libraries are sometimes good resources for pattern books -they're at 746.43 (I think) in the Dewey decimal system.
If you're interested in a cardigan and had a specific style in mind, let me know. I'm working on a lacier style now but hope to do a second one later this week and I haven't yet decided what the style will be so I'm happy to go with what someone else wants.
I have quite a few free patterns on my Pinterest board of Apparel, if that's of any help to you.