When I was wavering, I ran across a slim volume at the library on apocalyptic or adventist sects. It was an informative book and I don't think the writers had any particular agenda. It told the story of the Millerites and how the Witnesses and the Seventh Day Adventists sprung from them. I couldn't put it down. Very informative.
The thing that really got me was that when Miller's dates didn't go like he thought, he or one of his followers came up with the doctrine of Christ's presence or parousia and they also called this "new light." This shocked me because this was always taught in the Watchtower as a divine insight the Bible Students leadership come up with and was a proof that God was leading the organization. It turns out they just stole these ideas from the Millerites.
Thank you all for your answers and comments. Very helpful.