Energy admixture - I don't even know what it does, and as a DM, I probably wouldn't allow it anyway, since much of what is in T&B is completely wacked.
Once upon a time, the PHB was all that we had, so ignoring the addition of munchkin feats out of the splat books, Ice Storm sucks.
The only metamagic feat that affects it is maximize, which just ensures that you do 30 points of damage every time. But good lord, that increases it by 3 levels! Folks, if you're casting 7th level ice storms, I've got some swamp land in Florida to sell you.
And everyone keeps talking about evasion this, and evasion that. When was the last time you cast an AE spell on a group of rogues, for crying out loud? Actually, when was the last time you cast an AE spell on *anything* after about 5th level? I mean, most DMs stop throwing orcs, kobolds and goblins at parties after about 5th level. Making both fireball and ice storm less useful.
But the evasion argument is pretty weak, IMHO.
I'm going to HR (house rule) Ice Storm IMC, to be 8d6 (4d6 cold/4d6 impact). That is a little more reasonable. I might even give it a fort save or be dazed for one round. No save on damage.