The key is to work within your means, and also really think about how serious you are about starting to play. You don't want to take on too much in the beginning economically speaking, but you also don't want to get something super cheap as the task of keeping the guitar in good playing shape can be a bit of a headache. Those Martin DX series guitars are great instruments, and while a little more expensive than your average beginner guitar, would be a great start. My vote is to go for it. I have played those guitars and they play great. Best of luck on the start of your path.