so i've been trying out things, since my gear was already fairly defense oriented anyways, and found a spec that makes me almost invincible (frozen and arcane enchanted mobs give me trouble, but stuff like plagued, i can just tank thru without ever losing hp). it definitely isn't an offensive build, but works well with my buddy, who runs an archon spec (i tank it, he spanks it).
i know, lol melee wizard, lol roll a barb/monk etc, whatever, i rolled wizard, i can go offensive still anytime i want, but can also do this to change it up.
anyways, spec is
this, as for gear, focus on resists and armor first, get some life on hit, then stack crit chance and int after that.
optional skills are mirror images (i liked them cuz they spam your skills, and it resets your cooldowns faster) and blur, those 2 can be switched out for whatever you like really. also, explosive blast (chain reaction) works good instead of meteor, since your images will also cast those but not meteor.
as far as rotations go, there really isn't one. cast your images once, then spam meteor, frost nova, and crystal shell (with critical mass, the cooldowns will be up about every 2-3 seconds). recast images when necessary, and use blades whenever you can't meteor (optional really, your images will blade constantly, that along with meteor crits makes your cooldowns reset really fast).