For me, personally, I went:
70 ~ 71: Level 4 Energy Charge
72 ~ 79: Level 21 Energy Blast
80 ~ 87: Max Stun Mastery, 1 Energy Drain
Then after that, I just maxed out Energy Charge, then Blast, then Drain, then Transform. In that order.
I don't find Shockwave very useful, as it would be replaced in 4th job.
At around 89, this build'll help you Gallopera with a party, since you can use your drain to recover the horrendous damage that Gallos inflict.
But that's just what I did. XD
Hope I helped a little.
PM me online if you need any additional help.