I have a craplin temperature controlled 40 watt, but as its craplin its stuck on full chat, the power is usefull most of the time but you cant hang about with it on delicate stuff. I also have a cheap fixed 15 watt but most components just suck the heat away, you end up hanging on to the joint and doing more damage than with a bigger iron. Result is I never use the 15 watt.
I have just built a starfish and cooked one component, but in honesty it was probably me being carless and rushing and not the fault of the iron. If I was to buy a new fixed iron it would be a 30/40 watt.
If I had the time I would hunt out a second hand Metcal SP200.