Stop dreaming Strabat, every one knows you need Kans
The GR series is limited in 3 main ways, obvious metal drivers, average x/over components and front bass reflex ports, oh and those lovely room interactions it generates due to the ports.
Having owned both for over a year, partnered with various amplification and front ends, the conclution was pretty stark, great up to a point, but basically if you would like to listen to real sounding timbre like instruments and less clouded mids and more presence, then do audition some speakers you will be surprised. I felt the same way, until I was introduced how things can sound.
I don't dislike the GR series (still use the centre & rears), It's just they can be clinical and cold and thin sounding in stock form, modding does help a lot, but again only so much you can do.
I would take the 20's over the 60's, far more articulate and groovy, the 60's just up the bass wobble factor and room mode issues.
Good but no cigar.