If it were actually my choice...
The only company I've done thorough research on and decided it's a place I'd like to work is Silicon Knights. I feel they have a great corporate culture and methodology for making games. Also, it'd be incredibly interesting to work at Nintendo, if anything just to see what makes them tick. There's other companies that make great games that I wouldn't mind being employed by but mostly I'd like to make my own great games. It's also important to me that I not work for a company that does movie licensed properties or is incredibly reliant on outsourcing (both of which are practices Silicon Knights don't partake in.)