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Wow! I love this design. Great job. It's simple, yet attractive. I especially like the version on the dark background.
The versions in the second image that tie into the logo is a great idea, too. Nice work.
My only issue is the subtext in the logo version. It seems somehow to take away from the symmetrical design of the logo, not quite lining up with anything in particular. It's also a bit small and hard to read. Sort of gives the feeling that it's just stuck there as an afterthought.
My best suggestion is to try repositioning it or removing it completely. You might be able to get away with lining it up with the S, so it's not just off center.
Otherwise, this is really nice. :)

thanks for your feedback! I agree with what you're saying about the subtext being out of place. I was having a hard time positioning it. I'll have versions without it, especially when the logo is displayed smaller. The company really wants the subtext, so I guess I'll just keep working with it. Thanks for your help! : )