I need a paper written, a single, but long (30p), paper at the graduate level, and I need to know who I can actually trust to do a good job.
I know this isn't what you want to hear, but it is the only advice you can actually rely on: there is no company that can guarantee you a good grade, unless you pay the same professor who will be grading the paper to write it for you--and you could probably buy the grade cheaper.
This site is a good place to start learning who NOT to use; there is no site that can be trusted to give impartial advice on the subject. Just as occurs here, people with ulterior motives necessarily try to have their voices heard as if they are being objective. If I gave you a recommendation and you trusted it completely, you would be acting incredibly naively.
Your best shot is to place a small (3-4 page) order on the same subject and with the same standards as the 30 page order with a company that isn't completely exposed as a fraud on this site. If the writer does a good job with that, request the same writer to complete the larger project. If not, you can try another writer at the same company or just move on and try somewhere else. Once you've found a writer you trust, stick with them.