Striker Build

Dash isn't too useful, as Haste overrides it anyways, and if you accidentally double-tap a directional button, it will waste MP. I'd recommend using the spare SPs on the Sprite instead.

Sprite's useless for every Cygnus, dude. People keep wanting to max it, when really it's not going to do anything worthwhile once you're out of 1st job. It does less than half the damage than a Bowmaster's Hawk. Dash consumes 5 MP if you accidentally activate it, and as any gunslinger can tell you, after a few levels of having it, you won't ever "accidentally double-tap." It's useful wherever a mount is useful (and usually better since you don't have to deal with mounting lag, being unable to pot, and 140 speed is almost as fast as 150 anyway), and you're not always going to have Haste.

Your 2nd job build has a lot of flaws. Energy Charge maxed before mastery, while not adding Blast until the end of 2nd job? Not maxing Lightning Charge, a permanent damage multiplier? That's like not maxing any of the elemental charges on a WK.

As for Cyanne's original question, from what I've seen it seems getting Blast to a usable level is highest priority, since it has much more power than any other mob skill for a while. After the essentials (HP increase, mastery, 6 booster) I'd get some odd number of points in CSB for a good range increase (probably 5 for 120 range), then build EC and Blast. Lightning Charge after that, then CSB. Then add a few to Booster and come back later to max it in 3rd job.