This website makes it easy to find out which legislators to contact about issues that matter to you!
This website allows you to select your state, your relevant issues (agriculture, appropriations, etc.), and then find out names and contact information for your state representatives based on key issues. There are Senate and House links so you can see parallel committees. Also, the representatives voting records, scorecards, and donors are linked to their names.
Here you go: http://legislativecommittees.org/