Peter is the text you are using going to be varible? If so, you answered your own questions because you need a font most people have on their browsers, like Verdana/Helvetica
Peter look at using eurostyle extended but in all lowercase, I've seen it done before and it looks cool. It breaks up the very square look of eurostyle. If you want contrast in look you might look at Font Bureau's Agenda or Berthold's Imago
I'm doing work on the Spider-Man 2 marketing and Eurostile is one of their approved fonts, along with Mata by T26, Register by Device, Bauhaus, and one other that escapes me right now.