Everyday card
Citi: MTV (food, book) 5%
Citi: Driver Edge (supermarket+drugstore+gas match the drive mile) 6%
HSBC: Orchard Bank 2% (credit line is low)
They are enough for me. But if you have huge purchase and int'l travel, continue ...

I have my small business and international travel, so:
Citi: PP Elite & PP biz(quasi 1=2 Thankyou)
Citi: Diners Club (BA 1=1.5 mile)
HSBC: Premier (no foreign exchange fee)
Chase: Countrywide card (everything 2%, no cap)
They are no fee for you if you purchase enough and no one would find PP biz and Diners Club balance in your personal credit report. But if you have huge purchase in China, continue ...

The best card in China
Discover More (quasi 1% cash back)and Sams Club Discover (quasi 1-2% cash back)