Dynamic Page Redirect

I am looking for the best solution to allow my web app to load a different version based on a parameter in there userprofile that is accessed via a SC Query.

Main users are loading pages in a default way.
For my USA users I need to have them see non-EU formated pages, we built all our pages in two templates ROW and USA.

I would like the auto redirect to send the user to the “/versions/USA/” section if there version value is US.

thanks.