The best Soldering Iron I have ever had has been one of the WASP/SPEC Racing 12v iron's. Big tip, good power and will solder joints with ease. Hot enough to ensure good transfer of heat between components being soldered.
The head is big, so for things like changing servo leads I use a small mains powered mapin £5 30W soldering iron, with the optional 4mm chisel tip (£3.99). Works perfect for that.
Solder wise I try to get flux core solder when im at a model engineer show at the start of the year, and buy enough for the year. there are some specialised non-corrosive flux pastes about, not cheap, but work very well though.
As mentioned keep the tip cleaned between soldering joints. When your done clean the tip, tin it well and then let the iron cool, it stops the head from pitting as the air can't get to it.
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