I have the Theta Gen VIII Ver 2.0 and Compli and I think you will find the Extreme's Dac's and the compli tied together with a good digital cable (Transparent Reference is what I use) to excel all the older Wadia Gear, I did use a 781i as a preamp and there was a little more air but some of the Theta body was missing. So unless you plan on making a serious $$ jump I would invest in a good digital cable, and buy some more music.
I have a Theta Casablanca III in my video system and it has an amazing analog preamp FYI.
I have a Theta Casablanca III in my video system and it has an amazing analog preamp FYI.