DAC with serial SPI interface

I need 8 DACs and I need that all 8 channel conversion time is maximal 1 microsecond.

There are some 8 channel DACs which are SPI, but conversion time from digital to analog is about 7-8 us...

So, I wondered are there some 8 channel DAC which could convert all channels in maximal 1us with SPI serial interface or I must take 8 separated DACs which would be work synchronously (which would share the same clock, but separated Data inputs - something like 8 separated SPI interfaces if it is possible; I would be use Cyclone III starter kit outputs to drive all 8 DACs).

...or to use 8 DACs with parallel interface which would require 96 pins (only for data inputs to each DAC 8x12bits) for 12-bit DACs, which will much faster as I think...

I need answers ASAP!!!

Thanks in advance!

Nikola.