Jennifer,
It has been implied in the discussion above, but may be worth stating explicitly: You really want a proper temperature-controlled soldering iron, i.e. one with closed-loop control, which measures the actual tip temperature and strives to keep it constant. That way, when you solder to some larger body of metal (ground plane on a PCB, mounting tabs on a jack or switch, larger plugs etc.), the soldering iron automatically applies full power to compensate for the heat sunk by that metal part, and keep the tip at the right temperature.
Whether that closed-loop control is achieved via a temperature sensor at the heating element and adjustable feedback loop, or via the fixed temperature magnetic/Curie effect tips Weller uses, is not a critical difference IMO. Individual preferences vary.
A decent brand soldering iron pays off in the long run, I think. The brand manufacturers offer a wide range of tips, and will still offer compatible tips in 10 and 20 years. Tips also live much longer than the no-name ones without oxidizing, compensating the higher tip cost. Weller, Ersa, JBC, Hakko... are all fine.