It depends hardly on the kind of keyboard/mouse you want. My recommendations, based on workstation I’m keeping at home:

Keyboards

• Logitech K780 (as @supersquirrel@sopuli.xyz said)
• Logitech MX Keys (full or mini, if you don’t mind about numpad), this is my top keyboard atm, the one I’m using as developer mostly.
• Logitech G413/G413 TKL (wired, but works nice out of the box, mechanical, perfect for gaming and typing)

Mouses

• Logitech G203 (wired, works nicely on Linux too)
• Logitech M650 Signature (my favourite mouse, actually)
• HP 430 Bluetooth Mouse (works nicely, and does not require dongle because it works throught USB)

Extra

Logitech devices use to have all-in-one dongles, so you only need one for connecting all devices, saving you some USB ports. The unifyied dongle looks like this.