Nurse Practitioner vs Clinical Nurse Specialist?

I'm currently in my second semester of nursing school which will give me my associates degree in nursing when I graduate in May of '09. I want to get my Masters degree in nursing and I am interested in becoming a Nurse Practitioner or Clinical Nurse Specialist. I see advertisements for online RN to BSN programs that are available to people with their Associates degree. I would like to work part time once I pass the boards as an RN, and hopefully find a job that will help put me through the rest of my schooling to get my Masters. What are the differences between Nurse Practitioners and Clinical Nurse Specialists? Is there a specialized Masters degree besides the MSN that I should be looking into? Any information about the 2 careers or schooling options would be very much appreciated. Also, I know how much work goes into obtaining a Masters. My mind is made up and this is something I am going to do no matter what it takes. Any info to get me headed in the right direction? Thanks so much.

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