I you wanted to go with Star alliance you could either have the miles on UA
which is 400,000 for first class. Or you could buy the miles, which would be 8,000 dollars. That would allow you to fly first class on any star alliance airline around the world in First class!!
It not to bad of a Price really when you think about it as SQ
and other airlines normally charge sometimes 10,000 dollars for JUST a round trip ticket.
On the star alliance website you can download a "star alliance mileage calculator." I use it alot to plane out dream trips!!