Pitching? To throw a name out there, Matt Garza was a Super 2 this year and is getting $3.35m. They have Price, Davis, Shields, Niemann, Hellickson, and Sonnanstine, with more on the way in the minors. Shields is signed for next year at $4.25m and has 2 team options. Garza will likely cost more next year. The rest are cheap or, in Price's case, working off original contracts. My guess is Garza would be the first one they'd shop. I have no idea what we could offer.
Toronto's starters are all young and cheap. I would not call Dustin McGowan a #1, but he is out of options and coming off an injury.
Maybe Chicago WS - Peavy has a huge contract.
Don't know what the Rockies have on the way, but Aaron Cook fits the profile of the Nats groundball pitchers.
Those are with minimal research.