Personally, I'm not involved in organized religions, although I certainly believe that there is a higher power.
The only reputable psychic that I know of is John Edward. I've heard him on reputable radio talk shows and went to one of his shows, as well. He really doesn't promise anything. From what I've heard and read about him, it's sorta of like a game of charades with the person on the other side. They use body language that he tries to interpret to make you think of the connection.
At the show I went to, he found a family that was going through a difficult time because a spirit had a family member in the audience and the spirit member wanted his family to help the other family in the audience. Neither family had met before. Of course, skeptics would say that they were phonies staged in the audience. However, based upon overall experience, the guy seems legit.
However, he'll never tell someone what to do. Most times it seems like he's making people think more of their lost loved ones which reminds the people of what those loved ones would want for them. So, maybe he is just talented enough to be able to make people focus and think.
There have been some instances where he's told someone that he see's the loved one making a 'rocking the baby' motion and asks if someone is pregnant in the family - over the radio. In some instances, the person says yes. Some say no - however, he has had callers who said 'no' and then later send an e-mail later saying that they just found out that their daugher/son/sibling is expecting within weeks of his question.
Anyway, proceed with caution.