Im a big fan of entry #8 ! I like that, its bold and strong, yet pretty!
entry #9 is nice, I like the gray, but the M with the feet at the bottom of it, it reminds me of legs... I feel like its going to run across my screen! I'm not sure how you could tweak it up just a bit to make it not look like legs, but make it different from the other M's, but the font and colors are good.
Entry #10 I think its pretty, but the M in the background is too much, too fancy, I like the background M on #5 better because it is very pretty, but simplistic, where as this M in #10 is super super fancy!