One of my favorite types of accent furniture is chairs. I am a huge fan of the cozy big ones with the matching ottomans in which you can snuggle up on a snowy day with a good book and a steaming cup of hot chocolate.
West Elm has a section on armchairs under $599, including this one, that I love and have been coveting for a bit- comes in a variety of colors and patterns as well:
For a more upscale look (and for a bigger budget), check out these pieces from Restoration Hardware. If I had the space to do so, I would definitely build a reading room around these pieces: