BLM Crit vs. Spell speed?

I have not done any personal testing with caps for spell speed or crit chance. At first i was thinking of leaning towards spell speed but after looking at the information that other BLMs have pulled. It looks like it takes way too much spell speed to drop the cast time / gcd down. Now I have been thinking of just stacking crit / determination.

What is everyone else's thoughts of crit vs spell speed?

gcd is useless atm. You get like .01 sec for 10 points. Crit is the best. Actually I want to socket with VIT. It always helps to survive something that should kill you. Especially if you can heal.

Adding spell speed also reduces the amount of time you spend in umbral III during a rotation so you're increasing the chances that you won't get to full MP before going back to astral mode.