I'd love to do this. Primarily I'm a graphic designer, so I'm happy to pretty up your presentation. I am happy to provide a recorded voice sample if you need it.
I've previously lectured on better use of Powerpoint, including the use of statistics and more modern information presentation technologies such as wordles and word clouds.
I am quite fluent with Audition and Soundbooth so the quality of audio will be very clear, and I can edit out any errors.
I am Australian born and bred, with an accent more similar to South Australian than Cairn's, that is, a little upper class and not very Crocodile Dundee.
If you would like an audio sample then please contact me with the required text.