smanza wrote:
i have an iTunes US account but I live in Singapore. ...
You must be within the Country with a Valid Billing Address and Credit Card for that Country to use the iTunes Store of that Country...
To Change Countries > http://support.apple.com/kb/HT1311
... Can I purchase and use an Apple TV in Singapore ?
You will only be able to use the Singapore iTunes Store...
iTunes Store: Which types of items can I buy in my country?