I guess it depends on if you're looking for a shooter or a museum piece.  If you're assembling it to shoot and enjoy, then Criterion is the way to go!  Their quality is spot on!  They do take a bit of work to install - they need to be finish reamed and have the front sight post brazed on... but it will be dovetailed for the sight post and drilled for the rear sight.  There have been a few guys here that had them installed, and I've heard no complaints!  FWIW, the CMP gunsmiths can and will do the work... but you will have to wait in line for their services.

Now, if you're building this to create a wall hanger, then an original barrel may be the ticket!