If you want something fast look for this: Quality cranks, aluminum frame, carbon fork, drop bars
To trick: Beefy. Like Hi-Ten or Cromoly frames. No carbon fiber anywhere. Its ok to save money by going a little bit cheaper on certain parts. You will be breaking them anyways.
To commute: In between. Carbon forks and all that are nice. BUt ive found that I get nervous with mine at high speeds and crappy roads. Also, investing alot in a commuter bike is like investing alot in shoes. Sometimes you get a great pair that feels awesome and lasts forever, sometimes you get the opposite. Either way, your usually gonna grind them into the dirt in the end.