I have a GSX Mini incoming for my HD800, probably in two weeks or so. I had a GSX Mk2 before though, and the GSX Mini being just so slightly warmer I doubt it would suit your needs. If you want to stick with SS amp with the warmth maybe you can try FLUX amps. I have an FA-10 which was for my HE6se but it also pair so well with my HD800 and has warm and full-bodied without sacrificing the soundstage (like violectric amp does). according to FLUX the other models like the 12 or 22 has even warmer sound than the 10 but I have no experience with those.