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To add to this, Google have a good primer: https://support.google.com/webmasters/answer/35291?hl=en There is some good info e.g. "No one can guarantee a #1 ranking on Google".

Hi there, If you have the potential to acquire movieguide.com, that's a great domain name. That said, you're right that this is a crazy competitive space and some of the competitors are giants like IMDB and Rotten Tomatoes! One option is to buy the .com and redirect it to the .org. If you engage in offline advertising (magazines, on the subway, etc.), you could use the .com because it does look more professional. You could have the .org continue to be the resolving website, after the .com is 301 redirected. We are always hesitant to recommend redirection (especially of an entire domain) if you don't have to due to the risk of lost rankings. The rankings are usually not too hard to get back, but it's never a sure thing.