Very interesting idea. I think it's a little premature in the offseason to be doing this kind of thing and I haven't gotten a good enough look at a lot of these guys yet, but for the sake of playing along here's my list as of now in terms of where I think guys will end up being picked:
QBs
1st - JaMarcus Russell, Brady Quinn, Brian Brohm (if he declares)
2nd - Troy Smith (could sneak into late 1st but I doubt it at this point)
3rd - Drew Stanton, Kevin Kolb
Borderline 1st Day - Trent Edwards, John Beck, or someone else that rises up boards
RBs
1st - Adrian Peterson, Marshawn Lynch
2nd - Michael Bush
3rd - Kenny Irons, Tony Hunt
Borderline 1st Day - Gary Russell, Kolby Smith
FBs
3rd - Brian Leonard
WRs
1st - Calvin Johnson, Dwayne Jarrett, Sidney Rice, Ted Ginn (not sure I like him here but I think someone will take him)
2nd - Jeff Samardzija (baseball commitment will dictate draft position), Dwayne Bowe, Robert Meachem
3rd - Craig Davis, Paul Williams, Anthony Gonzalez
Borderline 1st Day - Johnnie Lee Higgins (his 40 time likely will determine his placement)
TEs
2nd - Zach Miller, Greg Olsen
OTs
1st - Joe Thomas, Levi Brown
2nd - Jared Gaither, Joe Staley, Ryan Harris
3rd - Arron Sears, Tony Ugoh (I think both are a better fit at OG)
OGs
1st - Justin Blalock
2nd - Ben Grubbs, Josh Beekman
3rd - Manuel Ramirez, Tim Duckworth
Borderline 1st Day - Marshal Yanda
OCs
2nd - Ryan Kalil
3rd - Doug Datish
DEs
1st - Gaines Adams, Jamaal Anderson, Quentin Moses
2nd - Charles Johnson, Adam Carriker, Victor Abiamiri, LaMarr Woodley (could push into the 1st as a 3-4 OLB)
3rd - Ray McDonald, Anthony Spencer, Dan Bazuin, Tim Crowder
Borderline 1st Day - Jay Moore, Baraka Atkins, Ikaika Alama-Francis
DTs
1st - Alan Branch, Amobi Okoye
2nd - Quinn Pitcock, DeMarcus Tyler
3rd - Brandon Mebane, Kareem Brown, Justin Harrell
Borderline 1st Day - Marcus Thomas, Turk McBride
LBs
1st - Patrick Willis, Paul Poslusny, Lawrence Timmons
2nd - Jon Beason, Rufus Alexander, Earl Everett, Buster Davis, David Harris, H.B. Blades
3rd - Tony Taylor, Justin Durant, Stewart Bradley, Anthony Waters, Desmond Bishop
Borderline 1st Day - KaMichael Hall, Juwan Simpson
CBs
1st - Leon Hall, Darelle Revis, Marcus McCauley
2nd - Chris Houston, Aaron Ross, Fred Bennett, Daymeion Hughes
3rd - Josh Wilson
Borderline 1st Day - Jonathan Wade, Eric Wright, Tarell Brown
S
1st - LaRon Landry, Reggie Nelson, Michael Griffin
2nd - Brandon Meriweather, Eric Weddle
3rd - Tom Zbikowski, John Wendling
Borderline 1st Day - Michael Johnson, Aaron Rouse
BTW yes I realize I only have 26 1st rounders listed, 31 2nd rounders, etc. I'll leave some room for other guys to emerge after the Combine.