Depending on the quality of the projector, most any typeface that looks good on a computer screen would also look good for a presentation. Aside from type choice, good rules of thumb for typography are most important: Don’t use too much type on a given slide, keep the type large enough to read from the back of the room, and make sure the contrast is strong. Since presentations are usually given in the dark or low light, light text on a dark background can work really well. Best of luck!