Following on from my previous question, how much weight should be given to domain and social network name availability when naming a business? In my case, there are no other business' with the same name on the internet, meaning I've been able to grab the social network profile names and country tld (.co.uk), but the one thing standing in my way is the .com domain, that I really want rather than having to settle for .net or .org. Given the name and factors surrounding the domain, I don't think I'll be able to afford what the broker selling the .com domain is offering.
What is the common practise in this situation? When naming startups, do you typically just skip names that aren't available, or if the name is good enough (which I think it is), would you just settle for the .net or .org international domains?