This site seems to be better than the others. I have not met a scammer here yet. Plus the cost is reasonable. Some site are very expensive and most of the women look like models. Guess it depends on how deep is your pockets.
This is a good guide to which are scams, and which will actually be of some help. elenasmodels.com is very good, but a bit expensive. Be careful though since some sites will NOT allow you to converse with the woman outside their service, and will charge a fee to provide the physical introduction meeting.
Stay away from "free" site's...it's the old story...you only get what you pay for.
Generally women are seeking security from a partner...especially if they are to leave their family,friend's,culture and country....money is not the be all and end all...however you will need to spend some.
Sean