Hi Nala,
#6 is dafinately our favourite, we are not keen on the big R though. We like the o being replaced with a recycling logo, with and without a globe round the logo, or as a background. We also like the idea of the recycling logo going round the retronix text as a whole, with the o replaced with a globe.
We like the other designers grey colour scheme on the retronix text, rather than it being just a plain colour, so feel free to be creative.
Thanks
Retronix