As to the free layover in Dubai -- you will want/need to fly an airline that already forces you to have a layover in Dubai. So, for example, Air India flies to Dubai, but it's not going to be a layover on your trip, so it's not going to work out. I would check Emirates, which has a hub in Dubai.

Are you wedded to the idea of staying in Dubai, or do you just want a nice hotel? You should sign up for the Starwood American Express card, and if you do so immediately you might get the points by January (though of course there is no guarantee that award bookings will be available on short notice). If you are flexible, you might consider Etihad, which connects in Abu Dhabi, as well. And of course you have lots of options if you want to spend a few nights in Europe.