Boston Celtics: Glen Davis (6'8"), Sheldon Williams (6'9"), Brian Scalabrine (6'9")
New York Knicks: Al Harrington (6'9"), Wilson Chandler (6'8")
Philadelphia 76ers: Elton Brand (6'8"), Thaddeus Young (6'8")
Toronto Raptors: Reggie Evans (6'8"), Amir Johnson (6'9"), Pops Mensah-Bonsu (6'9")
Chicago Bulls: Taj Gibson (6'9"), Tyrus Thomas (6'9"), Luol Deng (6'9")
Cleveland Cavaliers: JJ Hickson (6'9"), Leon Powe (6'8")
Detroit Pistons: Jason Maxiell (6'7"), Ben Wallace (6'9")
Indiana Pacers: Tyler Hansbrough (6'9"), Solomon Jones (6'9")
Milwaukee Bucks: Luc Richard Mbah a Moute (6'8"), Hakim Warrick (6'9"), Kurt Thomas (6'9")
Atlanta Hawks: Joe Smith (6'9"), Josh Smith (6'9), Othello Hunter (6'8")
Charlotte Bobcats: Derrick Brown (6'8"), Boris Diaw (6'8"), Gerald Wallace (6'7")
Miami Heat: Udonis Haslem (6'8"), Joel Anthony (6'9")
Orlando Magic: Brandon Bass (6'8"), Matt Barnes (6'7")
Washington Wizards: Dominic McGuire (6'8"), Antawn Jamison (6'9")
Dallas Mavericks: Shawn Marion (6'7"), Kris Humphries (6'9"), James Singleton (6'8")
Houston Rockets: Carl Landry (6'8"), Luis Scola (6'9"), Chuck Hayes (6'6")
Memphis Grizzlies: Zach Randolph (6'9"), Darrell Arthur (6'9"), Demarre Carroll (6'8")
New Orleans Hornets: Ike Diogu (6'8"), David West (6'8") Darius Songaila (6'9"),
San Antonio Spurs: Dejuan Blair (6'7"), , Antonio McDyess (6'9")
Golden State Warriors: Corey Maggette (6'6")
Los Angeles Clippers: Brian Skinner (6'8"), Craig Smith (6'7"), Al Thornton (6'8")
Los Angeles Lakers: Josh Powell (6'8")
Phoenix Suns: Louis Amundson (6'9"), Jared Dudley (6'7")
Sacramento Kings: Jon Brockmon (6'7"), Sean May (6'9"), Andres Nocioni (6'7"), Kenny Thomas (6'7")
Denver Nuggets: Renaldo Balkman (6'8"), Kenyon Martin (6'9")
Minnesota Timberwolves: Ryan Gomes (6'7")
Oklahoma City Thunder: Jeff Green (6'9"), DJ White (6'9")
Utah Jazz: Carlos Boozer (6'9"), Paul Millsap (6'8")
And that's not including any player 6'10" or above, some of whom wouldn't be that hard for the 6'8" Cunningham to guard.
Examples:
Blake Griffin (6'10")
Branden Wright (6'10")
Anthony Randolph (6'10")
Matt Bonner (6'10")
Tim Thomas (6'10")
Ryan Anderson (6'10")
Rashard Lewis (6'10")
Michael Beasley (6'10")
Dante Cunningham can easily be a power forward in this league. There are 37 players in this list 6'8" or under that are at least part time power forwards, and I'm sure I missed some. Dante is stronger than most of these guys and just as athletic as the best of them.