Critical Hit takes priority over everything, followed by Direct hit and Determination. Skill Speed is in a separate category since it's basically a stat you want to get to a certain value then never touch it again. Presently, DRG BiS is one of the following:

http://ffxiv.ariyala.com/14T6Q - 723 SkS
http://ffxiv.ariyala.com/154TM - 590 SkS

If you have high latency, you may need to increase Skill Speed to accommodate. Personally, I'll be testing out the second due to how much downtime this tier has.