If you are looking for a heavy duty one see the link below I got mine for $60 and haven't had any problems yet. I used to get the cheaper ones and burn them up in a month or two. I use it to do almost any thing. It is too big for circuit board work though. I installed car stereos as a side job for about a year and a half and used it almost every day. It has 3 different sized tips for different applications, I have used it on PC boards (with a custom tip) but I wouldn't recommend it. The irons are so much better for finer work. It will get so hot the tip will glow and it will get to that point very quickly.
This is kind of a cross between a gun and an iron, the idea is great and works well.
Oh I almost forgot it has a life time guarantee
But I have a Snap On dealer that stops by my shop. There is a mechanic that we share a building with at work.
[link]http://buy1.snapon.com/catalog/item.asp?P65=&tool=all&item_ID=13907&group_ID=785&store=snapon-store&dir=catalog[/link]