As you don't do business in the US, does a .us domain really matter to you?
No, it doesn't matter to me - I just don't want a competitor to register it
AFAIK, KeywordKeyword.com does not give the right to KeywordKeyword.tv and so on. If you have a (unique enough) KeywordKeyword you could get a trademark and then you could claim protection for all extensions...
My name is a generic phrase - not a unique brand name