Best 2 minute software demos for front page of site

I've got a new software product to demo, i'm trying to work out the best way to do a '2 minute intro video' showing what it is.

I'm thinking that this will be on the front page of the website, so prospective customers get a quick look.

I've tried doing it in Prezi (too slow) and Camtasia (looks kind of budget) but i'm not happy with either.

Anyone got any suggestions or links to good demos ... (ideally low budget!!)

Thanks :)