I'm considering launching a fairly niche website that has the potential developing into major commercial venture. But all the possible .com domains are already taken. I'm not exaggerating - absolutely every imaginable matching keyword and combination of keywords is registered (although no one has implemented what I plan to do yet).
Needless to say, I don't have the cash to enter into negotiations with existing owners. I also don't plan proceeding with development unless I have a good domain name. Buying it later is not a good option, as I would have to promote the subpar domain first. Even if I succeeded, I see how major players in related fields would enter my niche, while having the funds to overbid me over a premium domain name.
The situation would be much easier if I could consider an extension other than .com. Can I? Are there any global non .com success stories? (and I don't mean a situation where they developed to a point to be able to afford a .com) The site would ultimately develop to a stage where it would accept payments from users, so I definitely need their trust.