I only use it for BIAB so I don't need a lot of extras.
You're thinking of this exactly backwards. This statement implies you're "only running Biab" like that's some simple thing. No, any digital audio software that renders and manipulates audio (which includes Biab or any DAW like Real Band) stresses the heck out of a computer.
There are no "extras" there's only the CPU, RAM and type of system drive which in the modern world means an SSD not a spinning hard drive. Any new PC with mid range power will have USB 3 so I guess an extra would be the number of USB ports. More is better.
You asked Matt how much higher. My answer: A lot. The computer in my sig that I picked up off Ebay used last year for $600 scores 3,287. That's middle of the pack, high end new machines can score 7,500. I just ran the new Geekbench 4 and they don't test single core any more, they have something called Open CL and my score is 17,815. I have no idea what that means or how it compares to the old single core score.
Anyway like was said, get the most CPU and ram you can afford with a minimum 256 gig SSD. 128 gigs would really be cutting it close for a system drive running audio apps. An i5 processor would be my minimum with an i7 much preferred.
Bob