I've never been happy with any of the Constitution Class ships in BC. Just never worked for me. I've found the meshes to be pretty old now, and the textures usually pretty low res, so, only one solution...
To recreate the classic!

I built this ship in about 8 hours. It's about as close to canon as I can get it, though I know the shuttlebay and nacelle "ears" need some work. It's currently 16518 polygons, which seem plenty to have it look very smooth, with zero errors. It's not finished yet, and after I optimize it and add the details I want, I expect a poly count in around 15k-17k. I don't know when I'll get to texturing at this point, but I'm basically putting this on my do to list... and high up.