Joomla and Mambo may be a good solution. I'm not sure about the Flash part but you can create much more flashier sites with these tools than you can an inhouse builder. Hostgator does have Joomla support so you can test it out. The nice thing is that it comes as an add-on with your account so it doesn't cost you anything extra to test it.
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Don't put the cart before the horse. Plan your website, thencreate it.
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