Good question, Missy, but it's a hard one to answer, because the repertories of companies change so frequently. Today, Atlanta Ballet has a more contemporary than classical repertory, but that could change by the time you're out of school. Three years ago, Boston Ballet was a Vaganova company with a lot of the Petipa ballets in repertory, but that has changed, too.
Here's a link to a web site that has links to company's home pages:
www.balletcompanies.com
Go to the section for the United States and look up the companies you're interested in -- there will be links to their home pages there. Most companies have their repertories listed. So you can read what they're dancing this year and get an idea.
Good luck