This post makes the assumption that these will be the Raptors starters for most of the season:

PG: Lowry
SF: Fields
PF: Bargnani
C: Valanciunas

This leaves the Raptors reserve lineup looking like this:

PG: Calderon, Lucas
SG: Ross, Anderson
SF: Kleiza, McGuire
PF: Davis, Acy
C: Johnson, Gray

The following are the benches of the Eastern Conference (rosters from with the advantage given to the team with the best of five position win (some are obvious, some are debatable, all are my opinion - feel free to disagree):

Point Guard Devin Harris
Shooting Guard Lou Williams, John Jenkins
Small Forward DeShawn Stevenson
Power Forward Ivan Johnson, Jordan Williams, Mike Scott
Center Zaza Pachulia, Johan Petro

Advantage: Toronto at PG, SF, PF, and C.

Point Guard Avery Bradley, Jamar Smith
Shooting Guard Jason Terry, Keyon Dooling, Dionte Christmas
Small Forward Jeff Green, Kris Joseph
Power Forward Jared Sullinger, Chris Wilcox
Center Jason Collins, Fab Melo

Advantage: Draw (Raps PG, C, draw at PF).

Point Guard C.J. Watson, Tyshawn Taylor
Shooting Guard MarShon Brooks, Keith Bogans
Small Forward Josh Childress, Donte Greene, Jerry Stackhouse Tornike Shengelia
Power Forward Reggie Evans, Mirza Teletovic
Center Andray Blatche

Advantage: Toronto at PG, SF, PF, and C.

Point Guard Ramon Sessions
Shooting Guard Ben Gordon, Matt Carroll
Small Forward Reggie Williams, Jeffery Taylor
Power Forward Tyrus Thomas
Center Brendan Haywood, DeSagana Diop

Advantage: Toronto at PG, SF, PF, and C.

Point Guard Nate Robinson, Marquis Teague
Shooting Guard Marco Belinelli,
Small Forward Jimmy Butler, Vladimir Radmanovic
Power Forward Taj Gibson
Center Nazr Mohammed
*Hinrich considered starter as Rose is out for most of year.

Advantage: Toronto at PG, SF, C.

Point Guard Donald Sloan, Jeremy Pargo
Shooting Guard Daniel Gibson, Dion Waiters
Small Forward Kelenna Azubuike, Luke Walton, D.J. Kennedy
Power Forward Jon Leuer, Samardo Samuels, Luke Harangody
Center Tyler Zeller, Michael Eric

Advantage: Toronto at PG, SF, PF, and C.

Point Guard Will Bynum
Shooting Guard Kim English
Small Forward Austin Daye, Corey Maggette, Khris Middleton
Power Forward Jonas Jerebko, Charlie Villanueva, Kyle Singler
Center Andre Drummond, Slava Kravtsov

Advantage: Toronto at PG, SG, C.

Point Guard D.J. Augustin, Sundiata Gaines
Shooting Guard Lance Stephenson, Orlando Johnson
Small Forward Gerald Green, Sam Young
Power Forward Tyler Hansbrough, Jeff Pendergraph
Center Ian Mahinmi, Miles Plumlee

Advantage: Toronto at PG, SG, C.

Point Guard Norris Cole
Shooting Guard Ray Allen, Mike Miller
Small Forward Rashard Lewis, James Jones
Power Forward Udonis Haslem
Center Joel Anthony, Dexter Pittman

Advantage: Miami at SG, SF, PF

Point Guard Beno Udrih
Shooting Guard Doron Lamb
Small Forward Luc Richard Mbah a Moute, Tobias Harris
Power Forward Ersan Ilyasova, John Henson
Center Ekpe Udoh, Larry Sanders Joel Przybilla

Advantage: Draw (Raps at PG, SG but Bucks at PF with SF and C also a draw but leaning towards Bucks).

New York:
Point Guard Jason Kidd, Pablo Prigioni
Shooting Guard Ronnie Brewer, Iman Shumpert
Small Forward Steve Novak, James White, Chris Copeland
Power Forward Chris Copeland
Center Marcus Camby, Kurt Thomas

Advantage: Toronto at PG, SF, PF and C. (PG and C are debatable but the average age of those 4 backups is 38).

Point Guard Ishmael Smith
Shooting Guard J.J. Redick, Christian Eyenga
Small Forward Quentin Richardson, Moe Harkless
Power Forward Al Harrington, Josh McRoberts, Justin Harper, Andrew Nicholson
Center Nikola Vucevic, Kyle O'Quinn

Advantage: Toronto at PG, SF, C.

Point Guard Royal Ivey Maalik Wayns
Shooting Guard Nick Young
Small Forward Thaddeus Young, Dorell Wright
Power Forward Lavoy Allen, Arnett Moultrie
Center Kwame Brown

Advantage: Toronto at PG, PF, C.

Point Guard A.J. Price, Shelvin Mack
Shooting Guard Jordan Crawford
Small Forward Jan Vesely, Chris Singleton, Cartier Martin
Power Forward Trevor Booker
Center Kevin Seraphin

Advantage: Toronto at PG and PF; draw at PF and C.

Final Tally: 11-1-2.

What do you think? I'm sure different conclusions could be reached examining each bench from an individual player basis or from a 6 through 10 man perspective but this was time consuming enough.