My boyfriend and I have already talked about getting engaged next year, and then try to get married between 8-12mos. So I know that he does want to spend the rest of his life with me, but at the same time I know I am taking a risk at going down there without any guarantees... He took this job because he knows how much I love this state... He is such a great guy to me... (I'm sorry guys I'm very new to this and I know I'm rambling, but I really do not have anyone to talk to about this)
The big thing I take out of your post is that YOU are not completely sold on this idea.
You know that your parents who are sensible, loving people, and only have your best interest at heart are going to throw a lot of sensible reasons about why this is a bad idea. None of that would matter if you were completely sold on the idea and had thought through potential issues and how you and your BF will solve these issues.
DH and I bought a house together when we were just dating and hadn't even lived together. We discussed our intention to marry and it was left as a vague, "we would get engaged at some point." One day I visited my parents and told them DH and I were buying a house. They were not pleased. They told me I was being foolish, not for any moral reasons, but because they think it's foolish to move in together with no "real" commitment. I nodded and smiled, and went about my business. They accepted things and we all moved on.
DH and I have since been happily married for 10 years, but I'll be honest the proposal took a little longer coming than I was entirely comfortable with, and I started to think perhaps it would never happen. So I would have a long think about how will you feel if BF doesn't propose for a year, 2 years, 3 or 5? Why not get engaged now? and plan the wedding for when suits. If you're not ready to get engaged, then why are you ready to move across the country for him?
I don't think there is any right or wrong to what you are doing, but I think you need to KNOW it is right for you, and then calmly and clearly tell you're parents what you have decided.
Like pp said, it's ultimately not for your parents to decide. They will express their opinion and that's ok. They may even give you things to consider that hadn't occurred to you. That's ok too. It's ok to hear their thoughts and to consider their ideas as part of your decision making process. BUT YOU decide. You don't let them think they have a say, or that you need their approval.
Good luck with your decision.