The Trek 7200 is a great bike. Very strong and durable and fun, but not as quick as any kind of road bike, of course.
How far are you traveling to work and back? If it's a short distance (under five miles each way), then almost anything will do. Once you pass five miles you have to really think about what's most important to you: speed, durability, comfort, etc.
I just bought a Trek Pure, but that's because my ride is just under four miles each way, and when the new bike paths are completed, it will decrease by a mile and skip two hills I currently have to climb.
Good luck and have fun.