If you don't want to get hassled at the border, bring a cute Asian girl and make sure she drives her Lexus, Audi, Benz, or Beamer. However, even if she doesnt drive a beamer but a newer model car and have the pretty Asian girl show some cleavage or at least dress fashionable chances are great that you will be let through..,unless of course you get a female guard.
I know a pretty Asian girl that goes to the US at least 3-4x a month and brings back $300/400 each visit but stays half a day. She declares the goods every time but she ensures she goes to a male guard and she is let through all the time without having to pay duty or taxes.
CCBA prides themselves for not profiling or showing favoritism but the reality is that they do sterotype people and have their favorites and can be "influenced" typically by a pretty rich [Asian] girl.