Bake
Setup with 4-5 AVS.. and then send your traffic to them to determine which is the best for you. Then is something happens and conversions drop u can quickly use the next one.
I would recommend (in order)
Naked Pass - $20 payouts for true free AVS + good referral system
SexyAVS - $20 payouts for true free AVS
Sexkey - $20 payouts for true free AVS
and
FNP $15 payouts for true free AVS
All these have pretty easy rules to comply with as well
best of luck
Nurgle