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A suggestion, you seem to use the word "mob" to mean a single villian. "Mob" is by definition, a group. I'd edit your post to state villian (or minion or bad-guy) and use mob for when you state "groups of mob" (which would really be a group of groups).
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I made the same mistake

Took a RL friend explaining it to me
In MMORP games "mob" does refer to single object, it's from the programming term "mobile object" and generally refers to any potentially hostile npc.
Now the real reason I posted - I'm about to respec my lvl 36 ice/ice and was hoping for some help. I think I've got the power selection down but I'm not sure about slotting. Here's the build I'm considering. Any comments on how to build a better blaster would be appreciated.
Exported from version 1.4D of CoH Planner
http://joechott.com/coh
Archetype: Blaster
Primary Powers - Ranged : Ice Blast
Secondary Powers - Support : Ice Manipulation
01 : Chilblain acc(01)
01 : Ice Blast acc(01) dam(3) dam(3) dam(5) dam(7) dam(9)
02 : Ice Bolt acc(02) dam(5) dam(7) dam(13) dam(15) dam(17)
04 : Frost Breath acc(04) dam(40) dam(40) dam(40) dam(43) dam(45)
06 : Aim recred(06) recred(25) recred(31)
08 : Hasten recred(08) recred(9) recred(11) recred(13) recred(15) recred(17)
10 : Freeze Ray acc(10) hlddur(11) hlddur(33) acc(34) recred(39) hlddur(39)
12 : Hurdle jmp(12)
14 : Super Speed endred(14)
16 : Build Up recred(16) recred(27) recred(31)
18 : Bitter Ice Blast acc(18) dam(19) dam(19) dam(21) dam(21) dam(23)
20 : Health hel(20)
22 : Stamina endrec(22) endrec(23) endrec(25) endrec(27) endrec(29) endrec(31)
24 : Stealth endred(24) defbuf(46) defbuf(46) defbuf(50)
26 : Ice Storm slw(26) slw(34) slw(34)
28 : Bitter Freeze Ray acc(28) hlddur(29) hlddur(33) recred(33) acc(37) hlddur(39)
30 : Ice Patch endred(30)
32 : Shiver acc(32)
35 : Blizzard dam(35) dam(36) dam(36) dam(36) dam(37) dam(37)
38 : Grant Invisibility endred(38)
41 : Body Armor damres(41) damres(42) damres(42) damres(42) damres(43) damres(43)
44 : Cryo Freeze Ray acc(44) acc(45) hlddur(45) hlddur(46)
47 : LRM Missile acc(47) dam(48) dam(48) dam(48) dam(50) dam(50)
49 : Ice Sword acc(49)
-------------------------------------------
01 : Brawl Empty(01)
01 : Sprint jmp(01)
02 : Rest hel(02)
Thanks