Hi, I had a black SCH1 that has been stolen, and I have found a Grey one. It has more headroom than my SCHZ (like my previous SCH1) but maybe too much. The black one was warmer in my souvenirs. I think that I like the grey less than the black. Maybe even less than the Z. Am I crazy? does any one of you have the two models (black and grey) ? Is there a real difference between them? I mean : is the circuit different?