50 Job gear (quested)
55 Grand company gear, dungeon drops (Amdapor Keep, The Wanderer's Palace)
60 Dungeon gear (Pharos Sirius, Copperbell Mines (Hard), Huakke Manor (Hard))
70 Darklight (Purchased with Philosophy Tombstones - Camp Revenant's Toll), 2* crafted gear
80 Crystal Tower drops (Labyrinth of the Ancients - Max. 1 drop per week), Ultima drops (accessories)
90 Mythology gear (Purchased with Mythology Tombstones - Camp Revenant's Toll), Coil gear (Binding Coil of Bahamut), Extreme mode primal drops (accessories)

Weapon progression:

55 Grand Company weapon, Darklight weapon (dungeon drop)
60 Ifrit weapon
70 Garuda weapon, 2* crafted weapon
75 Moogle wepaon
80 Titan weapon, Relic weapon
90 Zenith (+1 upgraded) Relic weapon, Coil/Allagan weapon, Primal wepaon (traded for credits from Extreme Primal fights)

For DPS classes, upgrading relic weapons should be a high priority! Unless you're expecting to get tokens for Ex Primals (as some of these weapons are better e.g. BRD)…