I have to say that the A380 will probably win. Boeing really pulled off a marvelous achievement in flying 11,664nm from Hong Kong to London, but the A380's sheer size is very much in its favor.
Also, Airbus has never been awarded the Collier Trophy. Boeing has won several:
1955 - B-52 development & operation (with USAF)
1970 - 747 in commercial service (P&W and PAA also recognized)
1982 - 757 and 767 co-development
1990 - V-22 (with Bell)
1995 - 777
1999 - Super Hornet
Since the 777 has already won once, I predict that the 2005 Collier Trophy will be awarded to Airbus for the A380, unless the committee wants to wait until 2006, when the first go into airline service.