Ice/Ice synergizes much better compared to Fire/Ice... Ice/Fire on the other hand is pretty beastly.
I think Ice/Ice is overkill on slow debuff but it has a good theme for sure.
Jack Frost VS Imps? You don't need to babysit Jack as much as he has slow around him and when he is chasing the target, he won't aggro as much. As for those Imps, you really need to watch where they are chasing... you gotta Spank the Monkeys sometimes!
I have an Ice/Fiery. I enjoy a lot.
Ice is probably the least "controllish" of all the primary sets. Your main aoe control is soft control. My twin bro doesn't like Ice control much. He enjoys Earth control a lot more.
I used to really like Ice/Psi when Shockwave was on 10s recharge. That's a lot of pbaoe in Artic Air and Shockwave.
If this is your first dom, I would go with Fire/Ice.
What's left is to normalize all Assassin Strikes and improve Stalker's old sets (Claw, MA and EM)! You don't need to bring back the missing PbAoE attack. You just need to make the existing ones better! For example, make Slice a WIDER and LONGER cone.
Ice/Ice - I swear that just choosing this combo will give you a permanent -50% reduction on your endurance.
At least, you'll feel like that it has.
It's a good combo, but it goes hard, not long.
Ice/Fire or Fire/Ice these days Ice/Ice is just such an endurance hog. I wish a dev would look into the endurance costs of Icey Assault just way to high in my book.
My level 50 Dominators:
Madame Mindbender 50 Mind/Energy
Fly Agaric 50 Plant/Thorn
Nate Nitro 50 Fire/Psi
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It's a good combo, but it goes hard, not long.
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Lol. Thats what she said? 
I was wondering about a good powerset choice with something ice based. So I was curious, how does ice/ice stack up compared to fire/ice? Jack Frost versus the imps? Hell, how is fire/fire?