I/L Build, post BB

I'd probably agree with Amp as the first point; a single point for a 12% damage boost is pretty damn good. I did Amp as my first point on my F/P in GMS, and it was only 7% here. I don't know if they changed the mechanics of Ice Strike's range, though, since Ice Strike no longer has a range listed in its skill description. Maxed Ice Strike has a much greater range than Lightning Bolt, and would be worth using. Also keep in mind that there are more Ice-weak monsters to kill than Lightning-weak monsters.

I looked at the changed mob thread, and around level 70, there's really no mobs weak to ice or lightning. By level 71, I'd definitely be using Ice Strike.