Choosing a typeface can be very daunting. Each typeface has a personality that should match your content...the trick is finding a good match.
For example:
The simple geometric shapes of Helvetica (esp in lowercase) are bold and youthful, it may seem a bit sterile though.
Garamond has a rich history as typeface etched into stone. It has as humanistic quality to it, but may seem a bit stodgy.
Gill sans is a typeface that has the youthful, friendly feel of a san serif, but also the humanistic qualities of a serif.
If you want a good opinion on the use of classic typefaces, I'd suggest checking out Typographic Specimans: The Great Typefaces by Philip Meggs and Rob Carter.
Feel free to PM me if you have any other questions!