Headers?

IMO stick with the manifolds unless you want to make serious horsepower. Even the expensive ones seem to be a pita. Been discussevely. Search it.
We went manifolds to Accurate Exhaust with Summit 2.25 inch low buck Flowmaster knock-offs. Sounds amazing.
Edit:
just looked at your build pictures. Maybe that cam will need headers. Budget and good fitting headers don't seem to go together. Best of luck!