Large Monitor > 32" now UHD is out. £200-300
Perfect for lunch a la conference call when you have important stuff to do in the lunch hour. I like to walk around and tidy up while the divisional CIO is boring all 500 of us to tears. I like to really snooze if the VP is talking.
USR/Polycom soundstation £50 (previously enjoyed on ebay) again feet up for conf call and tames the accents nicely you can feed it from the PC.
Adjustable lighting (back lit -> front lit) I have 6 lights on a Set of Siemens (JSJS) switches. 60 watts of LED lighting flood lights my desk like a football stadium.
Alexa Dot - great for music / radio / traffic etc. Unlike DAB it can get a signal in wet paper bag. Feed into an Amp & big speakers your ears will thank you.
Nice clicky Keyboard.
Docking station with the USB3 ones you can get HD grade video & decent ethernet. Just one connection to your laptop, no need to faff about connecting lots of cables if you need to move away.
External HDD / NAS / Cloud for backups
I have a Trust wireless mouse as I have big hands - and you know what that means ladies
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Big Gloves!!!
Decent chair!
Nail artist / dentists magnifying LED anglepoise lamp, my eyesight isn't what it was and the writing on components , sims etc is smaller, get the ones at £40 from ebay the steel is thick! Not the one from Maplin mine tore through the hinges in 3 months.
Hot Glue Gun , with this Superglue & epoxy you can fix anything!