Heck, if you REALLY want a BiS weapon, wait for 3.35 and the next part of Eureka. The weapon will either be 365 or 375, and probably keep its 5 materia slots, making it the best weapon in the game for Black Mage. It comes with great SpS and crit (aka, the stat priorities for BLM), and the five materia slots mean you get to max out on Direct Hit or Determination for more glorious damage.

Hell, if the rest of the set reaches 360/370, it's gonna be BiS for the left side because of all those materia slots and its great for BLM stats.