Theres really no doubt..
Cams.com is by far the best. At 130$ per sale and a great conversionrate, their making me a freaking fortune
I stuck by them since I startet and they are still my number one sponsor. By my oppinion they just have the best product and the easiest layout. The only drawback is that they don't have the best promotional tools. But with some creativity you can easy make a 1:150 rate
Check my site for inspiration.
www.live-piger.dk
Good luck