Plenty of fish - free so gets a wide range of, erm how can I say it, "interesting people".
Dating direct - more women than men (as per most sites). Female friend at work got 200 emails in a couple of days. I got circa 10 in 3 months. No one replied to my emails - think the picture of the single speed put them off.
Fitness Singles - wow, people contacted me and everyone replied to my emails - some even commented on the single speed Everyone seemed normal. Not many people on there so you might have to travel.