Looks like Buick has been eyeing Acura lately. They're marketing the 2011 Buick Regal as a direct competitor to the TSX. Also thetruthaboutcars.com has recently posted some spy shots of what is most likely Buick's answer to the Acura RSX. Its another Opel being distributed in north america as a Buick.
What’s Wrong With This Picture: Buick’s Brand Integra-ty Edition | The Truth About Cars
What’s Wrong With This Picture: Buick’s Brand Integra-ty Edition | The Truth About Cars