Who Do You Use To Deliver Your iDating Site Emails?

OPW - Apr 28 - I'll build this post based on your comments. Who do you use to deliver emails to your internet dating site users effectively and at a reasonable cost? Who sucks, who's been great to work with? 

I'm hearing good things about Acceleration.biz, Datrans Stormpost, and ReturnPath are worth a look-in. But, who do you use, and why, and who did you stop using for your dating site?  Please add your comment, and I'll review them and build this post out into a permanent guide for OPW readers, based on your feedback. Thanks. - Mark Brooks