Here is Excelsior. She's supposed to have transwarp drive (cough cough chuckle). Even though that experiment failed, it's still a cool ship. Obviously, this class of ship became the backbone of starfleet. They still use it 80 years later, along with the Miranda class.
Updated 9/25/11- I added some color correction to this model. I also built this one for real. I compared this new model to my original Enterprise B, and the Excelsior is so much bigger and better looking.