Alfa Yea this one

Bravo Thanks, do you think the ends of the line are OK rounded off like that?

Alfa I think that looks good, maybe try a few other ways

Bravo Is it clear that the logo is two 'C's' making an 'S' ?

Charlie I'd steer clear of this one. It's in use by this company: http://www.spectra-physics.com/ (ps. I'm not saying you plagiarized or anything - designers often come to the same solutions...I know this because I came up with this shape once and had to scrap it!)

Bravo Holy shit no way!

Delta I feel like the white should be the same width as the black and it should be the same width throughout, unless your going for a perspective type thing in which case make it more obvious