I'm glad that I had the AKG K1000 to turn to. Since using the HD800 and HD540II alongside one another from the same DAC/amp, I missed the HD800's improved bass weight and purer resolution when I went back to the HD540II yet when I left the HD540II to return to the HD800, the rhythm/focus just wasn't the same and I missed the engaging neutrality that I was used to having. I wasn't fully satisfied with either but the K1000 is everything I could possibly want from drivers close to the ears. They don't quite have the distance you would get with nearfield/midfield monitor speakers but it certainly doesn't feel that music is confined inside the head. Really pleased with the progress I have made over the last couple of years.
I don't personally find the bass on the HD40 ref golds bad at all - it's not in the Audeze LCD2 style, but it's more accurate imho, and tighter. I'm no bass freak!