I would definitely recommend the Qutest. Lots of us sell Chord on-line and offer 30 Day in-home trial. Your only risk is return shipping which is about $16 as it fits nicely in a USPS Priority Mail Medium Flat-Rate Box. I send out like three a week.
If you were running a SS amp to the Zus, then it would make a lot of sense to go with the MHDT. But, you may be doubling down too much with the Melody EL34.
If you were running a SS amp to the Zus, then it would make a lot of sense to go with the MHDT. But, you may be doubling down too much with the Melody EL34.