DSD128 pushes the ultrasonic noise above 40-50khz already, so, i dont expect or so a rationale for significant playback benefits above 128. Well implemented DSD64 already is a revelation, and 128 is only stunning in that you dont expect to improve upon "perfection" but you do get a subjective 5-10% bump up in SQ!
This is NOT a knock against quality PCM, just a different flavor of Ben&Jerrys! Smmother versus fruity explosion...its a mood/preference thing.
There is so little DSD128 available today that you could simply keep you MA-1 and get a Geek to play DSD128 until you see a major revison or implementation that blows you away! No need to chop and change...
Besides, from what mike said, its likely that the firmware roll in January will enable 128 on the MA-1...that is what i intuit anyway. We have been waiting on the Chord Qute HD to do the same for 6 months now.
Incidentally the Qute is a PCM champ when fed with superb LPSU, but DSD64 is just adequate. I surmise that its is NOT a true DSD Dac now, BUT given its FPGA architecture, they COULD possible enable an alternative filtration pathway for DSD when it sense the signal and perhaps boost the performance. Lampi "pure" tube/SS filtration DSD sounds much better to my ears at the moment. The Duelund caps also contribute nicely to the output analog signal.