Theta Gen. VIII V.S. Wadia 27

I own a "vanilla" Wadia 27 which I am running direct to a pair of Threshold T400 amps. I have been reading on the Web the limited information on the Theta Gen. VIII and one thing that attracks me to it is the fact that it has an integrated analog pre-amp.

Has anybody have made a comparison of the sound and performance of this two units?
I want to find out which way I should go. Either modify the Wadia 27 through GNS or sell it and buy a Gen. VIII.

Thanks!