I have a 60 watt ECG iron with wedge tip that I got for about $15 at Fry's electronics. It works great for soldering 12-10 gauge wire and related connectors.
I was careless and originally purchased a soldering iron that I thought was a 60 watt Weller soldering iron. My confusion was created by the bold labeling that said. "60 Watt" and the small type that followed that said, "performance." It is actually a nice, fast starting 18 watt soldering iron ... but it does not perform like a 60 watt. I am/was rather upset with Weller for labeling this soldering iron with such nonsense. It just doesn't have the heat output of a 60 watt iron (how could it?) - which, BTW is the important factor when soldering thick wires. It isn't high temperature you need, it is enough heat.
I also have a 100 watt iron, but frankly it is overkill ... so far.