That looks like a good list. I've not had much experience with ZCI barrels but can vouch for EdGI and PDI ones.
However, I would really again encourage searching these forums. There are numerous build logs and questions around the VSR and is is one of the most documented guns out there. I'd probably just go through all that and see what people are/were doing and form your opinion off that rather than relying on a single person or even small group of persons to dictate what you do. I will say this though: The most overlooked part by anyone who's not built one before is the bucking and nub combination. Straight hop, R-hop, just a Maple Leaf bucking etc. - those are what have the most debate around them and should be carefully considered.