Before I say what I think the best capital ship designs are... WHERE CAN I GET THIS??? I love RD!!!!
Now, onto rants. First, from Babylon 5:
Narn G'Quan class Starcruiser
The Earth Alliance's Omega Class Destroyer
Non-Babylon 5
NS-966-C Nadesico C
And lastly, the Flagship/Carrier from Irresponsible Captain Tylor. I think it was called the Ho-Oh, but I'm not sure. I couldn't find a picture, will have to screen-cap it later.