The NCC-1701, TOS or TMP both variations are amazing. Though the TMP uniform (STII and beyond) is just smart looking. I would love to rock that.
The least NCC-1701 D. I know that alot of people love that ship, I still think the design is ugly, the uniforms are horrible, especially at first, and the Holodeck seems to break down and become real way to often. I don't want to unwind in a place where I could be shot to death. Don't they have TV or Movies in the 24th century?