Build Powerpoint or Flash Presentation for Seminars

I need a Powerpoint or Flash presentation for a business seminar. This will be the first of approximately 10 separate presentations required in the next 6-12 months. Bids should be for the first presentation only at this point. I will provide the writing required for the presentations and need you to design the actual PP or Flash presentation. Some animation and audio would be nice. The anticipated amount of slides per presentation is expected to be somewhere between 30-50. When discussing the project I will tell you exactly how many slides are required and will supply the writing for the slides. Having said all this I am open to ideas and comments regarding how this should be done. If you can provide examples of previous work that would be beneficial. Not entirely sure about the cost as it depends on the type of product you are intending to deliver but I'm thinking of around the $100 mark per presentation. Delivery for the first presentation would be expected in about 30 days after order. Many thanks.