Opamp swap first, because it's easy (if you know how to solder SOIC8 opamps, at least). Minimal to no change. PSU itself...eh, maybe a little change? I did that next. I decided to roll with it more "just because I can" than because it changed the sound much. Going with datasheet-specified series resistors on the outputs was a big, big difference. That came last. Maybe I fucked something up, or maybe it measures like ass now. I dunno. I at least enjoy listening to it now. Given that, I don't know how the PSU and output change sound in isolation. But I'd wager similarly to what I found. Note that installing series resistors on the output requires cutting traces, so not for the faint of heart.