Nice entries, Rachel!
Especially fond of #37. Have some input/requests if I may...
Would you please consider trying the following?
First, please remove the bottom serif of the "E" that's poking up out of the wave form.
Second, refine the letter-spacing (kerning) a bit. The O and C are too far apart while the E and A are too tight. Just needs evened-out overall.
Please and thanks!
-Geoff