Best medium to use for project

I need to produce a video that will play on plasma screens in an office.
The content doesn’t have to be interactive, it just keeps looping.
Stuff like bulletpoints about the company (animated in) and voice overs about the company, and photos. There really isn’t any video footage to be used.

I at first thought flash would be the best choice, but I’m beginning to think I can deliver a better product using other means.

I just got CS3 and have never used, AE, Premiere, encore, etc.

Does anyone know what the best way to produce this would be?
Also what document size do i need to consider when developing this?