If you can make money (with the keyword on page two) if it were ranking on the top of Google, and you have any related keywords that you can rank to add to this domain by adding content, and the domain is a buying keyword, I would go for the .net.
11 years domain age is nothing to disregard. It creates a hell of a lot of authority just from the age, especially if it had been online continuously. Quality pages on the domain will rise in PR quickly, do it right and you will have an authority site in no time.
If you can add and rank more buying keywords, it will be a goldmine.
A new .com will take a heck of a long time to get that kind of authority.
Do the research and make sure that it has comercial value, if it does, I woudl go for it.
If the leyword has no commercial value, buy the .com.