Quad Brimars are up there as well and far cheaper. The fellow in the store bought them immediately after listening them - and he'd heard the Melz/MO combo. I still love that Brimar combo a lot!
He described the Melz/MO combo as "ridiculous"..and they are.
With that Dave/Grimm combo with the Melz/MO I would say it was perfect for my taste. Audio..I had completed it.
The Grimm emparts a beautiful sweet, natural tone and the Dave, Melz, MO ultimate detail amd soundstage.
Combined it was extremely detailed but also completely natural, unforced and non fatiguing. This is all with Susvara. Bass is hard hitting and voices just sound live and real.
The Dave has a lot to do with some of these traits but it's the synergy with those components combined was jaw dropping from my perspective. I honestly can't imagine anything sounding better than that.
Synergy with your equipment matters a lot here. Look how many components are involved..the track, the cables, the power conditioning, DAC, amp, driver tubes, power tubes..there really isn't a simple answer of "these tubes are the best".
I found a magical combination for me but it might not be what everyone wants.
There are some awesome suggestions on this thread. Have fun tube rolling guys.