Not sure how similar the V280's signature is compared to the V200, but the V200 is not an ideal pairing for the Z1R in my experience, since I believe it colours sound just a touch by expanding sub bass and upper mids, two areas the Z1R's already have emphasised.
In all honesty I prefer the O2 and HP-A4BL paired with my Z1R's compared to the V200. Neutral sounding amps or DAC's with minimal colouring of sound would probably be more ideal for these headphones, and they're so easy to drive, with such low impedance, you really don't need mammoth power or anything absurdly priced to actually get the most out of them. Any additional equipment adding warmth or musicality runs the risk of tipping them over to being just a hair too dark, at least for my liking.
Agree. And to think I was trying to sell the Aurix, LOL.