I posted a bit of a long winded question a few days ago - here's trying again (in brief)
This is my wizard:
http://eu.battle.net/d3/en/profile/ggrechbnet-2600/hero/35431179
I'm playing in groups at T2 with ease, thinking of bumping up to T3 to see if drop rates are better. I must have had about 6 set pieces drop today and over 15 legendaries - nothing remotely useful aside from the boots.
I've been using electrocute/frozen orb since the expansion really, and find it really suited to my playstyle, but I can't get ahold of a Winter Flurry, or other gear that'd really let me push +cold. I have quite a bit of +lightning (64, plus + electrocute (23) = 87% on electrocute), which ends up working quite well with my weapon (fulminator) and my ring (wyrdward)
But a couple of times in my groups (even though I think my gear is decent, and the build does quite well in group play) I get quite a few comments about my 'profile being "noob"'.
I have never seen a fire wizard - most other wizards I see are arcane these days.
Essentially: I'm asking what you wizards do to push up to T5-T6. My toughness is way too low. I don't think I can with a lightning/frost build, or perhaps I'm missing a few key pieces of equipment. Spec change, gear change; both, to go to a higher Torment level?