"After using OS software such as PHPList for our customers, Oempro is a revelation when it comes to usability and flexibility. There is no sense in developing your own e-marketing software (what we considered for a while), since Oempro does everything you need, and comes with a very reasonable price." — Rudy Dierckx
I found myself in the exact same predicament and have done the exact same. Oempro does what I need and I recommend it to all my clients.