I have around 13years experience in running paysites, so here's a few answers for you.
First, go with NATS as its currently the best affiliate program option out there. Good to hear you are looking at multiple processors as it never hurts to have backup ready to go if something happens with your primary and NATS will allow you swap them out with little effort.
Second, affiliates care about only 3 things, do you convert, what do they get paid, and do you pay on time. If you can give them good answers on those 3 things you will have no issue bringing them in.
Hope that helps and good luck!
