Let's start with the status of the current 40 man roster and 60 day DL guys. (Using Cot's Baseball Contracts)
Pitchers:
Luis Atilano (60 Day DL)
Collin Balester
Miguel Batista (FA)
Joe Bisenius
Sean Burnett (Arbitration)
Matt Chico (Arbitration)
Tyler Clippard
Ross Detwiler
Jesse English
Livan Hernandez
Juan Jaime
John Lannan (Arbitration)
Jason Marquis
J.D. Martin (60 Day DL)
Shairon Martis
Ryan Mattheus
Yunesky Maya
Garrett Mock
Scott Olsen (Arbitration)
Joel Peralta (FA?)
Atahualpa Severino
Doug Slaten
Craig Stammen
Drew Storen
Stephen Strasburg (60 Day DL)
Aaron Thompson
Tyler Walker (60 Day DL/Arbitration)
Chien-Ming Wang (60 Day DL/Arbitration)
Jordan Zimmermann
Catchers:
Jesus Flores (60 Day DL/Arbitration)
Wil Nieves (Arbitration)
Wilson Ramos
Ivan Rodriguez
Infielders:
Ian Desmond
Adam Dunn (FA)
Danny Espinosa
Alberto Gonzalez (Arbitration?)
Adam Kennedy (Team Option 2m salary or .5m buyout)
Ryan Zimmerman
Outfielders:
Roger Bernadina
Bryce Harper
Willie Harris (FA)
Justin Maxwell
Kevin Mench (FA?)
Nyjer Morgan
Michael Morse (Arbitration)
Josh Willingham (60 Day DL/Arbitration)
It seems obvious that Willingham comes back from the 60 Day DL and simply slots into the position being vacated by Willie. Hopefully Mench is gone as well. Martin and Walker will likely get offered arbitration, and as long as everything works out in the Nats favor, will be brought back to the 40 man.
I would guess that the most likely guys to be in the conversation to be removed from the 40 man, other than the 3 definite FAs, are Bisenius, Mattheus, Olsen, Thompson, Nieves, Kennedy and Mench. Don't be surprised if Morgan is gone.
7 open spots, with some internal filling (Wilkie etc.), should allow for a good move at 1B, an upgrade to the corner OF/OF depth, and maybe a SP if a good one slips through the cracks.
At this point, if the FAs file, the team looks something like this:
C-Ramos
1B-???
2B-Espinosa
3B-Zimmerman
SS-Desmond
LF-Willingham
CF-Bernadina
RF-Morse
Bench-Rodriguez, Gonzalez, Morgan, Maxwell
SP-Zimmermann
SP-Hernandez
SP-Lannan
SP-Marquis
SP-Detwiler
RP-Walker
RP-Stammen
RP-Slaten
RP-Clippard
RP-Burnett
RP-Peralta
RP-Storen
Keeping Dunn and adding a corner OF makes a huge difference.
I think the team offers Dunn arbitration, sees him refuse and file for FA, then resigns him once the market prices him down. I'm about 60/40 or more that Dunn stays eventually.
That brings up Crawford/Werth for an OF spot moving either Maxwell or Morgan out of the picture. I expect Morgan to be the one to go. The market shouldn't go crazy for both corner OF but a trade may be the better option (especially if a Rasmus caliber player is available). I'm not convinced that David DeJesus gets his option picked up in KC. Same goes for Coco Crisp in Oakland. More options prices down the market there as well.
I wouldn't be surprised to see someone like Matt Chico paired with someone else surplus to the 40 man roster to acquire another MI backup.
There are a bunch of good enough SPs that should be on the market with the potential for a couple more arms, like Arroyo and Harang in Cincinnati, being bought out. I wouldn't be surprised if the Nats picked one up, once 1B/OF are taken care of, after the first wave have signed and someone gets desperate to sign a one year deal and "prove" everyone else wrong. It would be nice if the Syracuse rotation consisted of Maya-Detwiler-Martin-Milone-Martis/Mock due to a FA signing.
I would expect a few names like Wilkie, Carr, Milone, Burgess, Norris etc. to move onto the 40 man at some point next year.
Here's my best guess of what we'll see as the Nationals next season:
C-Ramos
1B-Dunn
2B-Espinosa
SS-Desmond
3B-Zimmerman
LF-Willingham
CF-Crisp
RF-Bernadina
Bench-1B/RF Morse, C-Rodriguez, OF-Maxwell, MI-Gonzalez, MI-Trade acquisition
SP-Zimmermann
SP-Hernandez
SP-Lannan
SP-Marquis
SP-FA (Bonderman/De La Rosa/Lilly/Pavano/Westbrook)
RP-Walker
RP-Stammen
RP-Slaten
RP-Clippard
RP-Burnett
RP-Peralta
RP-Storen
That seems reasonable and doable. It gets rid of Morgan, keeps 1B strong, strengthens the OF, adds more depth, and improves the rotation. You can switch Bernadina and Morse if Roger doesn't get his bat up to a .750 OPS with .350 of it in OBP. You see what happens with the FA SP and make moves for 2012 accordingly once you find out how well/quickly Strasburg is healing.