^Overused, but that's okay.
Personally, its Gill Sans and Avenir for me. I really like Geometric or Humanist Sans-serif fonts.
Edit:
I forgot my personal favorite script font: Shelley Volante.
I love arial and authentic highway fonts. The Helvetica family is nice, but doesn't have the angled ends.
Helvetica > Arial
According to Max Kerning, "Arial is to Helvetica what Cheese Whiz is to chevre. Don't be disgusting."
Univers > Helvetica > Arial...oh snap!
The lowercase "j" in Futura has always bothered me.
Check out the various Bernhard fonts, from long ago. My grandfather designed them, and sold them decades ago, so I have no stake, but some of them are very elegant.