I also want to mention that the Nats should take a look at John Maine. Maine is a good kid with the talent and nerve to pitch in the minors. The Os left him in AAA for most of the year and could be an option. How much the Os would want for him is another question.
I would have severe doubts that you could do a fair deal with Baltimore. Angelos would sooner die than open the door to making a deal that would help Washington more than the Orioles. Sort of like the Reds are with Jimbo, it's hard to imagine the teams actually dealing with each other in the normal fashion.
Overall great post, just wanted to comment on this small piece.