The Hakko 60W iron works quite well:
http://www.hakkousa.com/detail.asp?C...ID=2932&Page=1
Yeah, it's only a 60W iron, but it's not just the power rating, it's the size of the tip. A larger chisel style tip has more thermal mass and will be able to solder 10-12GA wire with ease. And for the smaller jobs, use a smaller tip.
However, a smaller tip on that iron may get too hot, so you should have some sort of variable heat station. You could go out and get a full-fledged soldering station, but to save a few bucks, you could make a dimmer-controlled station, like I did:
http://rc-monster.com/forum/showthread.php?t=19227