Marcus,
I represent Focal Click as the affiliate manager. In regards to high conversion rates, it would be better to ask the assitance of the affiliates in this community. I do know that the answers will vary widely and you will not get a definitive answer. All the affiliate programs listed at CAP are great choices.
A great way to start may be to take a look at some of the sites that affiliates have listed in their signature and see whom they are promoting.
Best Regards,