Hi,
An experienced transcriber here at your service :)
You're welcome to see my reviews regarding this type of work. I mainly did multiple-speaker seminars, but I also did interviews. The one that was really challenging was conducted over the phone :) I also have experience with transcribing Australian accents (this I did on Elance).
I can provide you with samples of my work, if you're interested. Normally, I finish 1 audio hour, together with proofreading of my work, in one day (obviously not the entire day :)) depending on the sound quality or the number of speakers.
As for the price, if $50 per audio hour fits your budget, then great - let's get start right away. However, I'm open for discussion about this.
And last, but not least, I really love doing transcriptions, so, please consider my proposal. Thank you.