snopro,
No worries at all and other opinions are always valued.
I haven't had the opportunity to hear any of the Supratek's,they are generally hard to come by.
Your comparison of the 2 completely different preamp topology's are spot on and it comes down to system synergy and user sonic presentation preferences.IMO.
I directly replaced a Valvet soul shine and a modwright ls-100 with the MZ2S in my system.
My preferences are to have the speed and transparency from the MZ2S as you mentioned and I prefer to get texture,tone,liquidity and realism from the pwr amp that I'm using.
Your post is greatly valuable and these comparisons will give porscheracer more info in his search.
Kenny.