Hey Scott,
I still like #66 the best, but something is off with the power symbol. I'm not sure really what, but I think it needs to be gray and beveled or inner shadowed or something. Kind of like this:
http://www.shutterstock.com/pic-53409448/stock-photo-metal-power-button.htmlIf you could do something with the shield and make it have a gray metallic outline with a beveled inner shield, I think it will do wonders for that part of the logo. Basically I want it to kind of look like this, but a shield instead of a circle:
http://gurutrack.com/images/power-button-icon.gifIf the inner shield had a shine similar to the circle in this one also it would likely stand out nicely:
http://www.shutterstock.com/pic-7507528/stock-vector-power-button-icon-series-four-colors.htmlLastly, if you can put the "computer repair" that you have on #48 onto #66 but make the color black, that should fix that part of the logo.