Before you go buy anything, remember that IT ISN"T ABOUT THE EFFECTS. It is about your personality, the spectators dont care what the effect is, just that you relate to them and make them laugh. Now their are certain exceptions, like counting tricks, that you never want to do, but work on developing your own magical personality, and design your favorite tricks around those. A great book on restaurant work is Jim Pace's "The complete guide to restaurant and walk around magic." Search around, you can find it.
I very much agree with this. However, I also once heard Derren Brown in a lecture saying that in his opinion restaurant work needed to be somewhat impactful, as much of his magic/mentalism is. He said that in the short amount of time you meet someone, you want to impact them so much so they will remember what has happened to them and come back in hopes of experiencing it again.