if you want volume, try buy.fpctraffic.com or
www.fpcclicks.com. Ravo is a good guy and can deliver a lot of hits. I'm getting 4k a day right now from his type 3 popunders, and I'm seeing about 95 - 110% prod.
It's decent traffic for what it is. But it's not clicked links.. Traffic-out usually shows between 340 and 400% prod.
I don't know what Choker's traffic does in terms of productivity - I sent that to specific galleries, and never tracked it that way. But, I made a few sales that easily paid for the traffic.