Draggynn

Additional information from Black Scorpion here.

1) Relax, only the resistance portion of ID is being made AoE, the mez portion like clear mind will stay single target, which I think is appropriate. (although I expect a whole new subset to be in up arms)
2) There is an option to ignore movement buffs from powers (speed boost, AM, ID, IR, Enforced Morale)

I love these, and they are in genre too!! Anyone else see these and think BAMF doll?

So the short answer is that /ice have better AoE due to having blaster level damage in Blizzard and Ice Storm, while /sonic will be better against single targets due to the -res, so it depends on your strategy.

Also, my money would say that picking the AV appropriately and built for defense, any Storm Defender can solo AVs. Granted sonic may have an easier time, but I've solo'd them on my Storm/Psy (pre incarnate stuff even) and as long as you aren't trying to take down AV that is resistant to your damage type and that you can survive against it's doable.

Also I'm a little baffled by your feeling useless against hard targets, since hard targets are one of the places Storm Defenders really get to shine. You can use Snow Storm and not worry about the target dying right after you use it, if there's a single target to focus on Tornado can dish out pretty impressive damage, which when coupled with Freezing Rain certainly isn't useless.

Just for future reference it is usually easier to do the short form rather than the long form export as it requires less scrolling on the part of folks looking at the build and can be easier to get a sense of the build as a whole. A few quick thoughts looking at this:

1) If you're going to go for Scorpion Shield, I would try to see about fitting some smash/lethal defense bonuses in there to capitalize on it and hit the soft cap.

2) 12 points of KB protection is probably more than you need, I would free up a slot by dropping down to 2 KB IOs.

3) Optimal slotting in Stamina with three slots is 1 endurance mod and Performance Shifter Endmod and +end, although with Heat Loss, the extra HP might be worthwhile.

4) I would verify that the energy manipulator chance to stun works as hoped. I'm not certain what the state of this is, but it used to be slotting the chance to stun in some end draining power would only have a chance to stun you and your allies. If that's the case, you probably don't want to slot that there.

5) As hindenburg said, move the numina. Slotted there you will only get the benefit for 120 seconds after using Vengeance. The KB IO, however is global and is fine there.

I will point you to the guide in my sig, although it doesn't cover Tornado and LS yet...they're coming soon (but probably a month away).

My general thoughts looking over the build is that you have been too erratic. Your have tried to go for a little of every type of defense, and as a result are soft capped to nothing. You will be far stronger soft capping ranged than dabbling a little in everything. Because Hurricane essentially negates melee attacks building for melee defense can be a waste.

Snow Storm: just put an end reducer in there, with FR you're already at the recharge cap.
Steam Mist: that run speed IO doesn't really buy you any extra defense, and won't make much difference to your playing
Freezing Rain: Accuracy is of minimal importance in Freezing Rain, and I wouldn't worry too much about the defense debuff. See the guide for more detailed FR information. Recharge, Recharge, Recharge, is the short version. Again, hurricane makes melee defense a waste, and if you want defense, go for the soft cap. The difference between 35 and 45% defense is massive.
Hurricane: I don't find the FF proc to be useful for my playstyle, but your results may very.
Tornado: Gah, you went for IO set bonus again instead of slotting for the power. Damage and recharge in Tornado, defense debuff is of tertiary importance. I understand your desire to debuff, but you will not see much difference in having more defense debuff. Honestly you would be better off (depending on how much you use it) going 3 damage, 2 recharge, 1 endurance IO. You would be better off going for something like blood mandates or expedient reinforcements.
Health: over slotted, remove one of those IOs, and make the other a miracle heal.
Stamina: again over slotted in your quest for set bonuses: 4 is the max stamina should really have: 1 end, 2 end/something, 1 +end.

Also, my prediction is that build may feel slow to solo, due to underslotted single target attacks and lack of a full attack chain, but if it works for you, great.

It can be difficult to give advice on IOs without a sense of budget, but Mids is certianly a good place to start, so that we can see exactly what you are thinking, and then you can post your build like Psylenz did.

In general there are two approaches for set bonuses that basically all builds can adhere to.

1) You want recharge. More recharge means more of your hard hitting powers (Freezing Rain, Lightning Storm, Tornado) up more often. Perma Freezing Rain, 3 Lightning Storms and 2 Tornados is an impressive sight to behold. The more recharge, the closer you can get to this goal.

2) You want defense (and ranged defense for a Storm Defender). If you can soft cap (45% ranged defense), then with the aid of Hurricane you can be virtually invincible until you get mezzed (although take a look at the new Clarion Destiny power in the incarnate tree).

I basically only play my Storm Defender so I have invested in two builds for him. I have a team build that focuses on recharge, and a solo build that focuses more defensively (although still with substantial recharge). That said, you certianly don't need to build for ranged defense to be survivable. Storm has enough tricks up its sleeves that with some practice you can take on pretty impressive groups without any fancy slotting tricks.

Some brief thoughts on power selection:
I'm not a huge fan of powers with endurance crashes, because everytime you use psychic wail you will need retoggle Steamy Mist, Tactics, Maneuvers, Temp Invul (hover, Snow Storm, and Hurricane as well if you happened to be using them). Which is too much of a pain for me to make psychic wail worthwhile.

I'm curious of your findings with provoke. It may help counteract the run AI from all of your slows, but I suspect you will find that you produce too much chaos for provoke to be particularly useful.

I suggest the guide in my sig. Tornado and Lightning Storm are still in the works, but just about everything I have to say about Storm is there. The numbers will be slightly lower for corruptors, but regardless the strategy is basically the same.