Hi - this is my vision of your logo. The idea behind was to incorporate 3d element with the strong connection to the medical area. This shape might also represent some sort of medical spaceship which has a strong connection with the company name - "Quest". Also - by using simple and modern font - we have very powerful logo. I think you might like it if you want something out fo the box.
#63 Your logo is the best rendition of a 3D look we have seen. My concern is that people will have trouble understanding the concept of the graphic with the vision you described. I like your out of the box thinking, but maybe using a familiar healthcare symbol in an unconventional way would be better.
The last one beautifully represents the tagline, "medical supply" - the wave shape that goes through the name and delivers the "medical cross" at the end. I hope you like it.