Hello and thank you for your first run of logo designs. I can tell already I like your work. Couple of things:
Please include the "Management + Development" in all logos.
Not a fan of the leaf in Entry 7, but maybe if it was situated differently it might work.
I like the simplistic nature of the Entries 4-6. But perhaps move away from using the "S" as part of the graphic--we are really open to anything so be creative in the shape as you want.
But perhaps add a little bit of red (or shade of red): Take a look at the colors on locusdevelopment.com, I am a big fan of the grayish blue and red color they have there. I also like the shapes they have. However, if you think of more color combinations please try them as well.