Yeah it does vary quite a bit. I'm a new grad working as an RN now in California. The money is really good out here, but cost of living is probably higher than in other states.
However, in the part of calif I live...I get paid well, but cost of living is less here than the Bay area or LA area. I was able to recently purchase a home for $330,000!! Obviously I am financing this, but I make enough money to even qualify for this amount of a loan (I just graduated in May!).
Good luck finding out more info on this