Just thought i'd weigh in on the Knipex debate:
If you include my snap-ring pliers I have about $1100 - $1200 worth of pliers in my box. I don't know why it's so weird for some of you guys to spend so much on pliers, as i've found way more variability in the function and quality of pliers that in many other tools. Maybe it's because i'm a heavy-duty tech, so i'm always having to hold hardened shafts etc.
As for channellock vs knipex, for me there really is no comparison. Channelocks are great tools for the money (in fact the pliers are better value than Snap-On IMO) but still not what i would consider a top line tool.
I think one of the biggest differences, for those guys asking about metallurgy etc, is that Knipex pliers are oil hardened. i think this is why the teeth seem to stay sharp longer than most. If you go to the Knipex home page they have videos and stuff on how their pliers are manafactured and what differentiates them from the competition.
And finally, if you look at the bottom picture you will see 2 kinds of water pump pliers i no longer use, one of which is Channellock (teeth worn out), just to prove I have tried and tested the competition.