Typically for 2WD SCT racing, I would start with a 7.5T motor for a reasonable power source and I would stay away from 3S unless you were going to run a 550 motor in a 4WD SCT.
For a reasonable budget I'd go with the Rocket Racing motors:
https://www.rcjuice.com/motor-esc/br...red-motor.html
Unfortunately they're out of stock right now
I've got a brand new unopened box for a Trinity Nemesis 7.5T that I'll sell for $45 shipped.
For a budget ESC this one here isn't half bad:
https://www.rcjuice.com/motor-esc/ca...-esc-2-6s.html
You kinda get what you pay for, so if you want a quality ESC then I'd go with this one here:
https://www.hobbywingdirect.com/prod...or-red-edition