As the title says, what are considered the best 2 box options (plus Mercs) for catching up to max level on phini?
Enchanter and Berserker. With clr/tank mercs. Enchanter will chain pull and keep adds slowed and mezzed while tank and berserker kill them. If you are feeling froggy you can charm a pet and use that dps as well.
Ench with a healer merc is very powerful for charming. Then maybe add a Mage + dps merc with that? Also really depends what class you expect you want to play once reaching max lv?