Don't forget Entreprise Arms M14A2 receivers if your going to have one built up. Entreprise Arms M14A2 receivers are machined from a forged billet, so its stronger than a cast one. According to Ted Brown of Shooter's Den in Oregon, who hangs his hat at Culvers Shooting Page's Garand and M1A forum, the Entreprise Arms receivers only need minor fitting (as do the SA Inc and Arsmcorp receiver as well) to make a very nice M14 type rifle.
I have a 1999 SA Inc "Loaded" M1A that I bought off the rack prior to taking the time to properly edumacate myself. Luckily, despite my impatiance, I ended up with a good rifle with almost all USGI parts that functions flawlessly and shoots bettter than I can. If I had it to do over again, though, I'd probably hold out for a pre-ban SA Inc or get someone like Ted Brown, Ron Smith or Clint Mckee to build me up and M14 type rifle using a Polytech, Norinco, Etreprise Arms, SA Inc or Armscorp receiever - in that order. Problem is, I've never heard of a stripped Chicom receiver for sale, so that leaves the other clones.