How much welding do you plan on doing?

I'd bet you will have way more headaches with a hard plumbed system than just having local bottles.

The only places I have ever seen hard plumbed welding gasses are large manufacturing facilities that have argon stored as refrigerated liquid in a central location.

If you are the only user and you aren't welding 8 hrs every day, I don;t see the benefits. Just opens you up for way more potential gas issues.