Animated 50-70 sec video explaining what our company does

We are a small company looking to produce a short video that explains to our customers what we do and how we can help them.

We require someone who can take the script we give them and turn it into a short animated video that potential customers can watch when they visit our website rather than reading a whole load of text.

As mentioned we will provide the script and we need this to be set to animataion and sound. We may be able to do the voice over part ourselves, or if you can organise this as well, please list it as an optional addon (accent would need to be Australian, English or American).

We are not too particular on the software or format used to create the video but the output must be professional, run smoothly and be easily viewed on our website.

A good example of the kind of video we are looking for is as follows (although we are looking for a shorter video):
http://www.youtube.com/watch?v=9Qx6fbt1ycA&feature=player_embedded

Thanks!