$500-$700 for a 2015-2016 mac book pro.
Mac mini is a great option too.
My philosophy is use what you've got.
The simpler your setup is—the faster you’ll be making great recording
I agree with both of these. Get up and running. Change what you need to later. I have a Rocksmith cable and Rockband mic plugged into a Mac mini and thrift store monitor. Works great. I A/Bed both with more expensive alternatives- interfaces, condenser mins, etc- and didn't hear any difference.