I agree with what ZN6 said. If you're not sure whether or not you'd enjoy the sport, I would recommend that you get a used bike with good components. That will give you enough time to determine whether or not cycling is your thing and if it is, a used bike with good components will last you quite a while. Though I'm quite new to the sport myself, I'm already on my third bike in two years. I probably have "new'itis," but I'm very happy with my current bike and won't be looking to switching for a while.
My friend was able to score this used Orbea Orca with Dura Ace 7800 from craigslist over the weekend for less than $1,500
