Have you considered the Spectral Screen range?
They are extremely customisable, so you can specify the width, number of shelves, and the individual shelf heights. I think you would need the 1050mm wide one, with the four shelves, probably with 210mm at the bottom, 160mm on the middle two shelves and 210mm at the bottom.
Being made by Spectral it has excellent acoustic properties, with the very thick glass sheets being almost resonance proof! This kind of quality does come at a price though, for your requirements you will be looking between £700-£800.
Have a look at:
Spectral - S133-BG | Premium Black LCD TV Rack Stand | BIG AV for an idea of the design of the Screen range.