I have never been disappointed by any of the offerings from these breweries:
Victory
Brooklyn Beer Co.
Magic Hat
I don't remember who brews it, but there is an IPA named "Unearthly" that is fantastic, and as a bonus is something like 12% alcohol.
Of the major domestic brews, I find Michelob the most palatable. Of macro imports, I guess I would go with Becks or Grolsch.
The Victory beers are by far my favorite though. If like me you don't have air conditioning in this sweltering summer, their white ale named Whirlwind is incredibly refreshing.