Thunderroad

I hate to be discouraging, but 150K Amex points is enough to get a a few folks back and forth to Europe in business class, not to mention first class. Plus there is the challenge of securing a three or four award seats on the same flights.

If you want to pursue this further, though, one route to go is to focus on getting bonuses through the various credit cards that can in turn be converted into Singapore Air Krisflyer miles. Your Amex points can be used for this, as can Chase ultimate reward points, Citi thank you points and Starwood Amex (which are different from the regular Amex membership reward) points. The appropriate threads in the credit card forums are places to learn more about these options.

Good luck!