For a classic serif font, consider Justus. The typographer responsible for this typeface has made a full symbol set available, as well as a variety of bold and italic versions, in addition to the normal letters and numerals included in most free fonts. In addition to other desktop publishing techniques, you can easily vary the font weight to give the appearance of using multiple fonts, but still have a consistent appearance. While Justus offers a conservative look, the typeface is also clean and elegant.