Havent used SexyAVS yet, I started a thread like this awhile back, <a href=https://www.sexkey.com/webmaster.cfm?id115442>Sexkey</a> does good for me too.
However, with <a href=http://www.universalpass.com/cgi-bin/webmasterjoin.cgi?12141>Universal Pass</a> I get 20$ a Free Sign up, and so far, its better and ads up quicker than Sexkey at 15, but not that much.... but it does make a BIG difference when you are talking about 30 + sales or more.
Do yourself a favor, In addition to the above, try <a href=http://www.universalpass.com/cgi-bin/webmasterjoin.cgi?12141>Universal Pass</a> they kick ass too.
My overall favorite is Sexkey though.
Good luck.
PS, SexyAvs does well I have been told, and the owner posts here too.
;)