@EasymodeX - The part about sneaky stuff was a semi-joke. :O

In the end they (CRIT, SS, DET) are all within a hundredth decimal point difference with current BiS gear when it comes to stat weighing. 1 DET will always be worth 0.2 INT, while Crit and SS will be dependent upon your avg damage and GCD, respectively.

All three are almost interchangeable in a sense. It all comes down to what kind of person you are or what you want.

DET = Boring person who just wants to consistently deal constant increased damage (yawn)
CRIT = Gambler who loves to see big numbers (raises hand)
Spell SPD = People who can't stay still for more than 5 seconds (Bard forum is -> way)

As for the mana tick factor, it is something to be considered. However, it is too inconsistent to be bothered with right now in my opinion. We'll see what happens.