My top 3 picks for sans serif fonts

Graphix  |  Designer: Christian Schwar  |  Get the font: 
http://commercialtype.com/typefaces/graphik

National   |  Designer: Kris Sowersby  |  Get the font:
http://vllg.com/KLIM/National

Urbana  |  Designer: César Puertas  |  Get the font:
http://new.myfonts.com/fonts/cepuertas/urbana/buy.html