Well, you are certainly free to make the choice for yourself, and it sounds like you've done a good bit of research. Be aware, though, that babies do sleep more deeply on their bellies, and this is one of the reasons that SIDS is more common in babies that sleep on their tummies. SIDS only occurs in babies that fall into the deepest stages of sleep, and back sleeping prevents this.
Once baby learns to roll, however, you won't be able to stop him/her from ending up on their tummy if they roll in the night, and sleep positioners become a hazard once they start rolling around. After a certain point, there's only so much you can do to prevent them from rolling.
One of the best things you can do to prevent SIDS is keep fluffy pillows, blankets, and stuffed animals out of their crib and keep cigarette smoke out of your home.
Bottom line, it's your decision - just make sure you get all the research from both sides of the coin.