Thanks all – really helpful!
DVD is a good idea, and I have made one as a back up. Im reluctant to use it, as Walter says its not 100% reliable . . . but good just in case.
Gone with playback pro, seems to provide the best balance of features. But its interesting that an AV company should need this amount of help, I would imagine they are used to just providing support of powerpoint presentations! I will certainly be suggesting other companies for next years event. Either that or I will do it myself!
Thanks again!
Greg