The 1701R, to me, is the finest example of a science fiction spacecraft. Equal parts aesthetics and functionality -- and its lines are just gorgeous to my eye. Some people bemoan its "1970s aerodynamics," which I understand ... but IMO, you'll never find a better compromise between looks and plausibility in Sci-Fi. She's just beautiful.
Never fell in love with the TOS original, and the Abramsprise is okay from a few angles. I have a feeling I'll like it better once it gets some "weathering." Sure would like to see an Abramsprise roughed up ala TSFS. That'd be a fun project for a graphics person, I bet.