At the moment - Beck's.
It's a question of mood and situation for me.
When thirst is one of the decisive factors, it has to be a bitter, strong Pils like Beck's or Jever - rarely a Flensburger.
When in a relaxed mood, I'll eventually change to a Weizen.
Then my favourite pick's Franziskaner Hefe-Weissbier.
When I've been in die US, to me, most of the beers I tested during my one-month roadtrip around California seemed pretty much lighter than the "usual" german beer.
Don't know where this impression comes from, but I felt like I never got really drunk.
And for the light-beer in the US - no comment.
We were stayin' at the house of an ICQ mate in Riverside for some days, and I introduced Paulaner Hefeweizen Dunkel to the uncle of our mate - he fell asleep after two thirds of the bottle.
@Doc
To be living near Kloster Andechs has to be pretty advantageous!