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According to Steve Sipple a sports columnist for the Lincoln Nebraska Journal Star in his "staff blog" states Oregon is the Holiday Bowls first choice over UCLA.:
"After discussions with officials from both bowls on Sunday and today, it's clear that the Holiday Bowl's first choice is an Oklahoma-Oregon matchup. "
1. If Oregon goes to the BCS Fiesta Bowl ( UCLA vs Nebraska)
"If Oregon would be a BCS at-large pick, the Holiday Bowl would then - and only then - match UCLA from the Pac-10 against Nebraska. Apparently neither UCLA nor OU is interested in a rematch of their September meeting (a 41-24 Bruin victory in Los Angeles).
Alamo and Holiday bowl officials are on the same page. "
2. If Oregon does not go to the BCS Fiesta Bowl (Oregon vs Oklahoma)
"It comes down to this: If Oregon is available for the Holiday Bowl, it'll be Ducks-Sooners in San Diego. The Alamo would then match Nebraska against either Iowa or Michigan."
Whether this would hold if UCLA were to Beat U$C may be a different story but this sounds like we do not need to worry about the Sun Bowl as a worst case scenario.
For the full story click on the title above for a link.