Wouldn't worry about buying armor with marks. Weapons are a better choice. You will find good armor but finding good weps is a bit more difficult Hung jury from dead orbit scout rifle is one of the best PVE guns in the game. 1000 yd stare sniper rifle from vanguard is very high impact and a great sniper for any situation including end game content Can't remember the name of the LMG but sold by crucible is really good. You can also use our marks to buy exotic armor/weapons for year 2