i am an account exec at a market research firm. We conduct focus groups and interviews that require transcription. We have tested more transcription companies than i can remember and the result has always be appalling: spelling mistakes, bad speaker identification ("male voice" for a female, etc.) and unclear pricing. Recently we have tried the services of a New York company, Ubiqus, and i feel they are the only ones i could recommend. Their transcripts are very accurate and you can tell that they are doing some research to get the nouns right and so fort. Always meet my deadlines. Besides, they charge per hour of recorded material, not per page like most transcription companies (who then fit about 20 words per page, why am i not surprised?).
Check their site http://www.ubiqus.com.