Well, so much for pointing the guy in the right direction...
Yes, you want to be yourself, you want to have fun and you most certainly don't want to be long winded (which is the biggest down fall of most who try thier hand at this or bizarre magick).
No, you shouldn't be mixing mentalism with magic tricks, but you're going to do it anyway and the bulk of the less experienced (and more commercial) will say, "it don't matter..."
I'm a firm believer in having and holding to a theme. For instance, if you can bend forks & spoons it is doubtful that you are predicting the headlines... that is, if you were a real psychic that simply isn't the case. At the risk of repeating myself (and something that's been preached in this craft for decades now) you want to look at what you're doing and ask
"How would a real Psychic do this?"
I can assure you, they don't have you do something as ignorant as write down a thought and then instantly tear up the slip you wrote it on... that's a magic trick (that can be used as a clever technique under certain circumstances -- seen Bruce Berstien's or my own notes on the subject)
Real Psychic's rarely display more than one primary gift in their younger years (teens into late 20s) though a secondary skill may start becoming more pronounced (at rudimentary levels) as they mature along with a tritiera ability. Most of the time these new abilities are but refinements of the first. Understand however, that innate ability differs from learnt skills; learning to be a dowser for instance, is a skill that can be cultivated in persons that show strong intuitive or empathic abilities. You wouldn't want to attempt this course of study with someone that had pronounced PK ability in that they might inadvertently make the pendulum or dowser's yoke move vs. the flow energy...
... yes, I'm taking a wide side track here, but this is how the public understands this stuff; the people that read about and study the paranormal vs. the more cynical attitudes of the magic world. As Cassidy points out, you want to be believable and to do this you must present material that is logical, practical, viable and plausible.
So think things through and find the logical path that delivers to YOU as the presenter of said mysteries, the greatest psychological advantage and thus, the greater control over the mind of your witnesses. Magic is presented with the knowing that it is a trick. Mentalism on the other hand invokes belief and investment from the patron... the two conflict with one another when it comes to the psychological approach of presentation as well as operation. Those refusing to see and respect that difference are merely fooling themselves and seeking to exploit the present wave of the craft's popularity and/or commercialism.