prismatic armor is actually better than force armor once you get to a certain gear level. but yeah, wizards are good times, it is my main class, i am working on getting inferno azmodan down now, now that i got belial on farm.
i highly recommend run speed, the cap is 25%, with 12% of it coming from boots. there are a few legendary/set items that give + to run speed as well, which is the route i went. i got a ring with 6% and pants with 7% run speed, and i really, really like being able to run fast, so much, that i am actually gimping my other stats by using those legendary's over rares with int/crit/ias/resists etc. regardless, being able to run faster helps so much when you have to kite all the time.