Brian, are you satisfied with ReverbNation's FanBridge? The email list signup form seems really clean, and I like the "add more information" slider/dropdown.
I'm currently using FanBridge, but I previously used ReverbNation's FanReach. Both have their plusses and minuses, and I don't really have a favorite. If you're using ReverbNation for other stuff, you might as well go with it. The $20/month "all in" option is a sweet deal.