for plastic levers, i like the yellow michelin ones. i they're wide, and i guess they're impossible to break...i've used mine like, twice, but i hear they have a good reputation... the pedro's levers also have a good rep.
my personaly choice are the old metal tire levers that used to be my dad's. i took them with me when i went away to college. these things will pull any tire. if i'm at the shop and having trouble with a stupid tire, i just go into my bag and pull them out.
BTW, a little off-topic, but stay away from the pedro's spoke wrenches (if you're so inclined) we got some at my shop to try out and i split the red one (most commonly used) on the first wheel i tried it on. granted, the wheel was all nasty and the spokes were all frozen and whatnot, but still...the thing shouldn't have broke. then the next day, our head mech. was complaining that the wrench felt like it was flexing. i looked at it, and sure enough, split down the middle. if you're into spoke wrenches, the pedro's are a really great idea! they have a little hook that wraps around 3/4 of the spoke, to help keep them from rounding off, but they're just not heavy duty enough. we called pedro's and they said they had a bad batch, and they're sending us two new sets. i'm skeptical though. as far as everything else pedro's makes, it's all good as far as i'm concerned. their pedal wrench is sweet, they're headset wrenches are sweet, their cone wrenches are sweet, and of course all of their lubes are nice. i just have an issue with their spoke wrenches.