Does anyone have some examples of some truly killer statements of purpose? I feel like it's a difficult thing to write and I'd love some of you to show me how it's done .
Like most things, there are also good books on the topic:
You could try, Graduate Admissions Essays: write your way into the graduate school of your choice, if you are specifically interested in getting samples of things to do/ not to do. But the staple guides to getting into clinical psychology programs (i.e. Getting in: a step by step plan for gaining admission to graduate school in psychology or the insiders guide) also have tips about what to do that are really helpful
I spent a fair amount of time on mine and think it came out fairly strong. The advice I have for you is to NOT make it like a longer, more boring version of your CV. While some of that info should be in there, try to make it read more like the story of who you are, where you came from, and why you are applying. Stories sell you better than lists and are more memorable. That said, have as many profs read it as you can read it and give critical feedback. Most of them are happy to do it and it can be really helpful.