The Toko Iron is nice and affordable, Swix is soso.
I work usually with Toko, Bravo and Holmenkol.
In any case it is worth to spend some extra bugs and you are fine for at least 3 seasons.
Better quality is needed to keep the temperature of the heating plate constant. With a cheap iron you mess with the wax, lots of smoke and there you loose actually the money in burning down the wax.
Bravo is the State of the Art Iron, but almost impossible to get for the US Market. (120V), (Manufacturer:Skiman Italy)