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Nope. I would buy the .com, and if/when you're ready explore international SEO with it; but for now I would just 301 it to the domain you've had this whole time. It's the one with links to it, the original content, and the right top-level country code for your target audience. I say this generally because the TLD isn't going to have the impact. But, I don't know anything about either domains. Was it used for a very similar business model/is it getting traffic, all that other stuff? Simply age and domain extension aren't enough reasons, but if you're buying a running and successful site, consider how you want to use that content.