Well, you've got three winners there.
Fire: Damage and more damage. No other effects, but hey - more damage! And it even comes with a click buff that gives you - EVEN MORE DAMAGE! You have an End-recovery power (Consume) to keep piling the damage on longer. Disadvantages? Fire has a lot of DoT effects, and those might disrupt your primary controls. It's also got a Snipe... that comes too late in the build to be useful as anything other than an IO mule.
Ice: All the attacks have a -Speed and -Recharge component, making this a way to debuff the enemies for some added safety. It also comes with Power Boost - a click buff that effects... well, everything you've got. It will basically double the duration of all your control powers, as well as having a few other benefits. Disadvantages? Like all Ice sets, it's rather End-heavy.
Elec - Well, Elec's secondary effect is End draining the enemy and giving you a little of that back. Some of the powers may even put some mobs to sleep for a bit. And Thunder Strike has a stun component. Elec also brings with it Build Up! That's always useful. It also gets its snipe early enough that it may actually be useful... if Snipes are agreeable to your play style. Disadvantages - the secondary effects aren't reliable enough to build for... even with Static Discharge you're not going to be a sapper. Also, it's big damage power is Thunder Strike - a melee attack. Instead of a big-damage ranged attack, Elec has to make do with Voltaic Sentinel, a much denounced pseudo-pet.
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I just rolled a Mind/Elec for my theme. So far everything is great. Damage isnt all that high, but it gets the job done.
So I'm thinking I'll roll a mind dominator, but I need to be sold on a secondary. I'm not a big fan of thorns, I am informed /nrg is bad, and I already have a /psi, so that's out.
So, fire, ice or elec? Don't have a concept and I'm open to any of them; convince me!
@Dysc, on virtue:
Virtue blues: Overnight (DP/MM), Kid Ridiculous (FC/rad), Panorama (Ill/time)
Virtue reds: Block Party (SS/SD), Goldcrush (earth/fire), Deadwire (claws/elec), Snowcrush (ice/kin)