I'm currently debating upon switching from a 21.5" iMac to a new 27" iMac. But the problem is, I have everything on my current iMac, and I need to get it to my new one if I were to buy it. I'd be selling my current iMac to put the money towards the 27". Is there a way to transfer all my data from my current Mac to my new one? That's the only thing that's really holding me back from going through with this.