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I totally agree with Moosa....I am guessing you also have limited resources. Maintaining two separate sites, one desktop and one mobile requires a lot of major time that most small businesses and small website owners just don't have. One version of your site that's managed via one CMS that is a responsive design is the way to go if you are short on time and resources...and let's face it...even if you are an enterprise corporation, you are still short on  on resources.