It really depends to a great extent how many tracks your are likely to be working with, how many virtual instruments (if any), how much simultaneous effects processing you might use, etc, etc.
I recently upgrade the computer in my studio to the specs below, and it performs perfectly. We use it for tracking live bands with anything from 5 to 30 tracks, and mixing/mastering a varying number of FX per track. We use Studio One Pro in the main, and Reaper for quick jobs:
AMD Ryzen 7 3700X processor (8 physical cores/ 16 threads)
Asus Prime B450M-K motherboard
33 GB DDR4 RAM
NVIDIA GeForce GTX 1050 with 2GB
Crucial M.2 P5 SSD 903GB as the main drive
Corsair SATA3 SSD850GB as the secondary drive
Two Dell P2719H 27 inch monitors.
If I could afford it, I would replace the monitors with bigger, higher resolutions ones, as they can get really cluttered if you've got a lot going on.
We use a Tascam Model 24 as the interface, as this gives us 24 input channels, and a number of outputs and monitoring option.
We use a Head Amp Pro 6 headphone amp and distributer for live recordings.
For easy control, there's a Presonus Faderport, which integrates perfectly with Studio One.
Monitors are Swissonic (Thomann's own-brand) ASM7.
For high level monitoring, there's an 800 watt DB technologies PA system.