And so in your case I'd happily blow my miles (you can see from my post above I'm a fan...). My preference would be to use them on Thai, you might even get lucky and get their new a380... Consider the flight to cdg too for the suites.

Why?
- Even in the best case with the miles post bmi you will struggle to earn that first class again
- Thai at bkk are amost the worlds best. You will get a great lounge, lots of cocktails, a spa, a golf buggy ride through the airport whilst you (optionally) wave to the unwashed masses
- It's a long trip to enjoy your flight, over twelve hours, and if you choose the midday flight you can spend all of that time awake eating and drinking
- Asian airlines service is top class