Since you will be a Senator for 2 years, I would look over the comparison chart (see link below).

Remember programs change from year to year and benefits one year may disappear in the next.

If you plan on doing a lot of flying in the US (personal or business), then UA is a good bet.

AC is my favorite for upgrading discount fares.

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BlondeBomber's Star Alliance Gold Comparison Chart 2000: http://members.home.net/deercroft/starall00.html

Dorian's Star Alliance RTW Price Chart: http://www.informationlab.com/rtw.htm
flyers'places - restaurant, bar & hotel recommendations: http://www.flyersplaces.com