I've put together a list of what I think is the single best way to develop each class:

Assassin - Dualist Melee

Avenger - Elemental Bow/Spear

Battlemage - Physical Dualist Melee Caster

Berserker - Physical Dualist Melee

Bone Charmer - Bow/Spear

Brigand - Bow/Spear

Champion - Dualist Melee Petmaster

Channeler - Elemental Huangdi Caster

Conjurer - Elemental Ternion Caster

Conqueror - Melee with Shield

Contemplator - Elemental Huangdi Caster

Corsair - Melee with Shield

Daoist - Dualist Melee

Disruptor - Poison Caster

Diviner - Elemental Ternion Caster

Dragon Hunter - Elemental Dual Throwing

Dreamkiller - Melee

Druid - Casting Petmaster

Elementalist - Elemental Caster

Esoterist - Huangdi Elemental Caster

Evoker - Elemental Beam Caster

Guardian - Melee with Shield Petmaster

Harbinger - Dualist Physical Melee Caster

Haruspex - Bow/Spear

Hermit - Huangdi Casting Petmaster

Illusionist - Poison Casting Petmaster

Juggernaut - Physical Caster with Shield

Magician - Elemental Knife Thrower

Monk - Physical Melee with Shield

Oracle - Elemental Ternion Caster

Paladin - Hybrid with Shield

Pilgrim - Bow/Spear

Prophet - Lightning/Electrical Burn Beam Caster

Ranger - Bow/Spear Petmaster

Ritualist - Casting Petmaster

Runesmith - Melee with Shield

Sage - Elemental Bow/Spear

Seidr Worker - Dualist Elemental Throwing Caster

Shaman - Dualist Elemental Throwing Caster

Skinchanger - Dual Throwing Elemental Petmaster

Slayer - Bow/Spear

Soothsayer - Vitality Ternion Petmaster

Sorcerer - Elemental Knife Thrower

Spellbinder - Melee with Shield

Spellbreaker - Dualist Melee

Spiritualist - Ternion Vitality Caster

Stonespeaker - Dual Throwing Elemental Caster

Summoner - Caster Petmaster

Templar - Melee with Shield

Thane - Dualist Melee Hybrid

Thunderer - Dual Throwing Elemental Caster

Trickster - Poison Caster

Warden - Bow/Spear

Warlock - Vitality Ternion Caster

Wu - Elemental Huangdi Caster

If you can think of a better way to develop a certain class, post it here.