Eco OpticLogo Design Contest

We are an optical store focused on delivering economical and good quality eyeglasses to our customers with low prices and excellent customer service.
Our core values are:
- Cheaper than other shops (~30% cheaper)
- Better quality than other shops
- Excellent customer service and counseling
- Never let a customer unsatisfied

We are looking to have a logo that looks professionnal, friendly and that shows our core values.
The health aspect of our business (eyecare) can also be visible in the logo but shouldn't be over-shown.
Our customers are french, if that matters.

Please avoid the color set of this logo:
http://www.davidgoad.co.uk/assets/images/EssilorLogo02.jpg

We like colors like green, grey, dark blue, orange...