Have to agree, Fat Tire is definitely on my short list here in US. Depending where I'm at...
- Fat Tire
- Anchor Steam
- Leinenkugel's Red
- Pilsner Urquell
- Shiner Bock
- Sam Adams
- Red Hook ESB
sorry, you said one...? I can't stop.

-- RIDE ON -- 2008 America Two-Tone Blue-on-Blue Pictures: http://www.bikebook.ca/bike/v/user/chuckkluz/