I like your both designs. For entry #9 I'd like to see the white swooshes maybe separated or something into more of a swooping "O" and slid behind the Sports Medicine.
On #8 I'd like to see it with no outlines on the words..
You know there isn't an either-or choice between the pure white "o" and the silvery "o". For t-shirts and hats, say, you'd go with the white version - for website and print, the silvery.
I have to tell you, everytime I look at your user name I think of Visigoths. Osmgeric, the Fierce Warrior Chieftan of the Visigothic Horde. Yeah, yeah, I know, I was (am) a nut for Roman History.