I wanted to get some opinions on whether I should book a trip Business or First class rather than Economy using United miles. As a result of the devaluation coming up, I'm trying to put together a trip from the U.S. to Hong Kong with a stopover in Barcelona. I've gotten my flights to price out at 65K in Economy with an agent, but now I'm starting to debate whether I should go ahead and use more miles to get Business or possibly First, especially since the miles cost will be too high to fly in Business and First in the future with the Star Alliance partners. The concern I have is that doing a Business or First booking would wipe out my United and Ultimate Rewards accounts. I currently have 100,000 United miles and about 47,000 Ultimate Reward points. Thus, a Business ticket at 120K or a First ticket at 140K would wipe out the United account and deplete the Ultimate Rewards account for the most part. I do have miles and points in other programs for other future trips - 40K in AA; 70K in US Airways; 80K in Delta; 55K in Lufthansa; and 40K SPG. Any opinions/comments will be appreciated.