I haven't used goldex, but have used goldage to convert $$ to egold. There are small but important differences between each of the money converting services. Fees, funding methods, turn-around time, all may be factors in deciding. The country that you are in may also be a factor. The best starting point for finding these sites is on the egold home page (egold directory link).

I would advise anyone interested to visit their websites, read their rules carefully and choose what you are comfortable with. If you understand what you're doing, the process is easy.