Depends, are you new to cycling? The type of bike you get will depend on what type of riding you want to do.
Best bet is to go to your local bike shop ask questions.
Also read some issues of Bicycling magazine, they do bike reviews.
Don't be too anxious to get a top of the line bike, I spin 500km a week and drop guys with bikes that cost twice as much as mine.
Time Trial mode:
hit me up on ICQ 402 733 61 if you want to talk bikes, also have some great forums you might want to check out.