I was a domain of which all extensions exept .com extensions are already registered. Will it be good to register that .com domain? The name looks like a japanese word. like kiyota.
Why not ? Since you already have the rest. To me the .com is most valuable and it be a waste that someone else takes your success away from you.
Put it this way, if you know a company is online but you do not know the URL and you try to guess it, would you try the .com variant first before the others ? People have been associating the internet as the Dot-Com and no one really call it Dot-Net or the Dot-Info.