Considering there were 6 episodes potentially to be made and the fight(s) had to come out from HBO Boxing...

My 6 episodes would be:

*Arturo Gatti vs Micky Ward Trilogy

*Oscar De La Hoya vs Fernando Vargas

*Kelly Pavlik vs Jermaine Taylor

*Manny Pacquiao/Erik Morales/Marco Antonio Barrera (The series of them fighting each other)

*Bernard Hopkins vs Antonio Tarver (They could make a good episode of this fight. Along the lines of Hopkins lost to Jones, Tarver whoops on Jones, Hopkins loses to Taylor twice, moves up in weight and takes the lightheavyweight title.)

*Lennox Lewis vs Evander Holyfield I & II