Differences in training and salary between PA, RN, LVN, and LPN?

Can someone tell me the differences in training and starting pay between a Physician's Assistant, Registered Nurse, Licensed Vocational Nurse, and Licensed Professional Nurse. Also straighten me out if some of the nursing titles are the same thing.
Thanks!

PA: Has a four year degree in any field (it doesn't have to be biology related, some I know have it in exercise science). One year of clinical rotations (cardio, nephro, ER, CCU etc) and one year of PA school, where you learn anatomy, diagnosis, meds and so on. Pay range $60,000-100,000+ a year.

RN: A two year or four year nursing degree (there are no specialties; those are learned later in the field). Pay range $40,000-80,000 a year, depending on experience.

LVN=LPN in most areas. Usually a one year program where you learn basic anatomy, technical skills and a little phlebotomy. Pay range $30,000- 50,000 a year.
Hope this helps you out. And, if you are thinking about one of these options, be a doctor. Trust me, it's better in the long run.

I am a loan underwriter and we use Salary.com to see average incomes for the applicants employment for their area. I wish I could help more with the others, but I do know that a PA is just under a doctor(may even require med school). They are just short of a doctor. A RN is a 4 year degree program(although some may do it quicker, but still a 4 year 'program'.)

A PA is the equivalents of a nurse practitioner, except they make slightly more $$'s (the American Medical Association is stronger than the American Nurse Association), however, a NP can own over 51% of their own business, a PA can not.
An RN makes typically $10-15 more dollars "base" than an LVN/LPN. An RN can have an associates or a BSN. An LVN goes to school for less time & does not graduate with a degree, simply a certification.
You can also check out salary.com for different pay rates in your State. Hope this helps!