Then there is also the fact that you might want to secure future TLDs by claiming them, just in case you want to expand to other countries or go international altogether. In essence, the perspective here is mostly business and its current and future business plans.
But did you consider the ability of seizuring domains by governments? Because this might seriously disrupt your business.
Top Level Domains and U.S. controlWikipedia has an extensive list of Top-Level Domains and for the obvious reasons I am not going to repeat them here (Wikipedia does a way better job there). But lets take a look at the following list with the best known TLDs.