Soldering iron recomendation wanted

[schlumpf]

Just one point to add, maybe you already considered. Use a good soldering tin with a few per cent flux inside. Only this makes the solder to float around the wires the way it should, breakes the oxidated surfaces. And be very quick as the flux vaporizes within seconds. If you wait too long it might appear as if there is too less heat. Fried tin doesn't float at all.
(Hope I got the wording right ..)