It may not be the absolutely perfect headphone for me, but out of everything I've experienced, the vintage, Normal bias Stax SR-Lambda comes damn close with its sound delivery and sheer comfort. The more modern SR-202 actually sounds a bit unrefined by comparison, and I don't think replacing the SRM-212 with a beefier amp is going to change that. It certainly won't change the higher clamping force the Nova-style headband/arc has over the vintage original series headband/arc.
Unfortunately, I don't feel like I can easily vote on the poll, simply because the SR-Lambda is vintage and discontinued, thus pricing depends entirely on what the used market is like at the moment for that specific model.