90%+: Fighter, Wizard, Cleric, Rogue
50%+: Ranger, Paladin, Druid, Bard
24%+: Barbarian, Monk, Sorcerer, Warlord, Warlock
9%+: Assassin, Shaman, Swordmage
0%+: Ardent, Artificer, Battlemind, Invoker, Psion, Runepriest, Seeker, Vampire, Warden
Put the first group in the Starter Box. Put the first, second and third groups in the Players' Handbook and make it 500 pages like Pathfinder (but also make a Dungeon Master's Guide).