I really don’t know about ED for CMU. That said, my thought is if you ED anywhere it should be the one school you love and would attend above all others.
If you don’t ED anywhere then I would EA to any schools that offer that choice. Better to find out early than later.
You have in-state Pitt and PSU for about $35k/year. I would use this as a benchmark. Would you attend a school like UMD, VT, or NC State for $50k/year or more? Save the money. MIT, CMU, Rice and others might be worth the difference. That’s something you have to figure out with your parents.
Good luck.