The most common asked question for a beginner is "Which Juicer do I buy?". The simple answer would be, buy what you can afford as long as you buy a juicer and start juicing. I myself started with the Jack LaLanne juicer, which I bought for $89 at Costco. I didn't want to invest a whole lot of money on something I wasn't sure I'd be sticking to. Needless to say, a year later I moved up to a Breville. Juicing made such a big difference in my health,there's no way I'd ever stop juicing.
My advice would be to start with what you can afford at the moment. The Jack LaLanne works great, you get your money's worth. The Breville would be a step up. It's a bit more expensive but does a better job of getting the most juice from your fruits and vegetables. The Jack LaLanne runs around $80 - $100. The Breville is around $100 - $200.