Powerful, yet, Modular Energy Sources

So I know that most everyone here has probably seen the new movie starring Robert Downey Jr., “Iron Man”. I also speculate that after seeing this movie, some of our minds were open to new ideas about flight of that level and magnitude. But… Is constructing a suit like that of Tony Stark’s possible?
If so, then what sort of energy source would be able to be that small and yet provide that much energy to lift about 150 lbs. of weight into the air and attain sustained flight for a period of time? And what kind of metallic alloy can withstand that much bullet fire and be light enough to fly as well?

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