We also qualify for the govt. rate at SOG (Contemporary until SOG finishes their expansion) and the govt. rate offered at the Swan and Dolphin.
I hope to never have to stay at the Contemporary! It just does nothing for me, I don't care if the monorail runs through it or not! I think it's one of the ugliest buildings on WDW property!
We've stayed at both the Swan and Dolphin now, and I like both, but for different reasons.
The Dolphin I think is more family friendly. There are more restaurants there, I think it's a closer walk to the Grotto Pool and it's just a more lively fun resort.
The Swan seemed much more quieter (even though it was a full house during our Easter break say in April 2001) and it's a more refined and elegant resort.
I will say that I like the bathroom set-up at the Swan over the Dolphin and the queen size beds at the Swan.
Other than that, the walk to the friendship boat launch (to take to Epcot or MGM) is equal from both resorts.
Go for the Swan or Dolphin!