You absolutely cannot beat the GTX2860 Gen II if you're looking for a direct bolt on turbo that needs the absolute minimum amount of modifications.
Value for dollar will go to the GBC22-350, but more modifications are needed as detailed in brndck's post.
Personally I'm a fan of the EFR line. The response is insane.
Don't waste your time with an aftermarket bottom mount manifold. If I was going to buy a new manifold again, I'd go top mount, even if I wanted to run a T25-flanged turbo.
You can modify your stock valvecover to work perfectly fine with a normal catch can setup, see this thread:
https://zilvia.net/f/showthread.php?t=235851