I liked Dan, he was a bit unorthodox by comparison to Ken and Ryu in style, but I like the challenge of characters without projectile attacks. His Super moves were badass too. Who else could beat Sagat down in pastels and still look good doing it?
As for the sigs, I think the old one has a little better flow to it. I think the color interaction is better as well. I think you need to tweak the BG on the new one, and adjust the sizing and spacing of the other elements. The pieces are there, the image is great, I like the animation, and the type works fine. It's the layout that needs work.