I also agree with above posters about the 8 primary classes. I believe the more ''exotic'' classes of 4e can be subclasses of the main classes. I dont remember the name, but in 4e when you chose to be a fighter, you decided at level 1 if you were a one-handed weapon specialist or a two-handed weapon specialist. Invoker, Avenger, Warlord, Swordmage, Warden, Assassin and warlock can be subclasses of another class. Then when you create your power lists, you just have to add some rider to benefit a subclasses or another.
Cleric: Warpriest, Monk or Druid
Fighter: Weapon master, shieldmaster or Warlord (be sure to have powers allow for ranged attacks not just melee like in 4e)
Rogue: Assassin (give some ''hunter mark'' or such, Thief (movement specialist), Bard (more controller with party buff)
Wizard: Arcanist (spellbook), Warlock (summoner/augur) or Swordmage (weapon as implement, more defense)
Wilder (Barbarian/ranger): Battlerager (classic barb), Beastmaster, Ranger
Sorcerer: Dragon Soul, Chaos Soul, Divine Soul (there you find your 4e Invoker)
Paladin: Knight (classic pal), Cavalier (mount based), Avenger (cloth armor, large weapon 4e zealot)
Psion: Ardent, Battlemind or Lurk