Aerodmb,
Not sure if you are interested in it, but if you are not called for a few months and you are not picked up by EK or EY, perhaps you could get an early 787 FO slot with your 777 experience... It is a possibility with the first few 787s arriving in the summer.
That said, EK is probably the better deal in the ME and they have plenty of 777s for you. I am sure it would be difficult to leave the 777 after flying it, even for something like this:
Photos: Boeing 787-8 Dreamliner Aircraft Pictures | Airliners.net
Good luck!