There's precious little to change since any change would necessitate the sale of gear.
Headphone Rig
Transport: Arcam - would only make a change if it fails somehow.
DAC: The Hertsens - not going to sell it.
Amp: The Menace, not going to sell it.
Headphones: HD650s + HF-1s, pretty content with these for as much time as I get to spend with them.
Soldering Rig
Source: Duet - better than it needs to be so why change?
Amp: SimpleSE - can't see any need to upgrade or change this, ever.
Speakers: ok, you got me, these will change, but the new ones are bought and paid for already so it doesn't count.