If you want a mains Iron this will do Motor Tags and ESC posts.
SEALEY Soldering Iron 100W/230V (e-bay)
Anything less than 60Watts tend to cool quickly if its a large joint or a metal tag.
For Field work Portasol Gas are great the kits include hot air as well as soldering tips
see
CPC/Farnell Portasol Soldering Irons They have a free postal delivery on offer til the end of May