#3 - like the effect, but looks too much like the Pepsi logo. #1 & #2 look too much like the Pepsi logo, also
#4 - brings energy, but loses the serpentine line (the letter S); probably won't work with charcoal background
#5 - makes the "S" more noticeable - would be better if not perfectly round (see current logo at
http://www.organizingsystems.com/images/organizing_systems_logo.html)
#10 & #11 - too sporty, like a tennis ball