Hi Nathan,
Check out the pastel thread dealing with substrates, methods, materials etc. There are some concerns about which pastels are lightfast as evidenced by the ongoing testing by the ASTM.
As a response to the findings at present, I would recommend the Windsor Newtons. They are reasonable, lightfast and hard enough to get a sharp point.
www.dakotapastels.com has a descending list of pastels in order of hardness.
My personal favorite is Unisons, soft, but they hold a great point. They are rather expensive however.
Sincerely,