It can feel a little small after a while, but if you are willing to put in some work there are enough interesting people to make it very worthwhile.
Eharmony.com
VictoriaHearts.com
Zoosk.com
Match.com
Okcupid.com
MeetMe.com
ChinaLove.com
Dating.com
RussianBrides.com
ArabianDate.com
AnastasiaDate.com
AmoLatina.com