Should be good. I'd go with Dark Blast, but I'll admit I have a thing for DB.
@False Fiction - Virtue / Defiant
Current projects - [Glaciologist - Ill/Cold Troller] [Cloudshaper - Storm/Dark Def] [Harald Wartooth - Elec/Psi Domi]
Is it too much to have dual slows? No, not really. You want to ensure that entire bunch of +4s cannot leave the Ice Storm / Blizzard you've just set up and that they are at the -recharge cap.
Ice/Time/Power is what I'm looking at too. Dunno if I'll do it straight away or when the next bunch of Premium Sets come out, when everyone will be making Street Justice and Titan Weapons meleers instead of Time support characters.
There is no such thing is 'too much' 
The recharge on several powers is still pretty long, with ice you are just pretty sure you have a -recharge ready at any given moment.
(i really love /time)
50)Sinergy X/(50)Mika.
(50)MaceX/(50)Encore
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I'm playing one right now on the VIP server, just hit lvl 7 (sorry, no AE farms) on a sewer team. Too soon to say but I do enjoy the fast-firing Ice attacks to offset the animations of the Time powers.
Is it too much to have dual slows? It has the benefit of no redraw and has a total of 3 holds across both sets. Am I a mad genius or what?