Thank you all; I'll try to answer your questions/comments:
Phenom00v: In my opinion the S looks good as it is, but it's just a matter of opinions. I'm going to keep it as it is by the moment.
wolfden: Thank you very much, glad you like it.
fenius: It looks that way because the white border "is" eating the S red. This is 3D and it's just the way it is. The white torus crosses the S red. Thank you for your enthusiasm.
lxnay: Thank you. I don't got it in vectorial format, it's only 3D by the moment, but I can try to rasterize it in inkscape. If the result is no good, I'll try to do it directrly with inkscape. I'll post the results later.
CheezePirate: I have tried with other colors for the border (red, orange) but white looks better to me. I Haven't tried black, but I'll do.
Again thank you all, thank you for the feedback.
By the way, I'd like to know which one you prefer, the one with the cones or the one without?.