/DRG was mentioned, and, until 50, is the best possible sub assuming you can afford a Wyvern Earring.

At 50 however you get Hasso with /SAM, which is by far the best sub you will ever have as WAR.

400 Sturmwind is very good actually, and even at 55 when you would normally get Rampage your peak damage would probably only be 750, averaging around 400 too, depending on gear.

Stick with GA. Sturmwind till 60, Raging Rush till 85, Ukko's Fury for the rest of your life (though you probably won't get that till 90 anyway). Kings Justice is good OUTSIDE Abyssea at 75 if you refuse to enter and get Razed Ruins. It's unlikely it'll be better than Raging Rush though if you gear for dDEX cap, which isn't really viable since you won't do much content at 75 outside of abyssea anymore. Basically I'm telling you to go to Abyssea at 75, or sooner if you so desire.

As for what GA should be used, hard to say until 69. Just get whatever is on AH. However, get Berserker's Axe at 69. You will be very happy you did. Then Vermeil Bhuj at 80, Widowmaker at 90, Ukonvasara until you die. Maschu+2 is a waste of time.