Check out Champions Choice http://www.champchoice.com/
This outfit caters to NM shooters, and is run by hard-core match shooters.
--- Springfield M1A Receiver $430
--- Springfield M1A Receiver, rear lugged $645
(this is also on p. 51 - 52 in their catalog, available online, but scanned, not interactive, at http://www.champchoice.com/catalog/index.p...res/page052.png
I would use the standard receiver. I know of no difference between a standard and NM receiver, as it is the tolerance on several other components -- and the build quality -- than make a rifle an NM. That being said, if you want a receiver to say NM or M-21, you can get them from Armscorp. Not much quality difference between any of these, other than the printing. (But if you were to buy even a standard Armscorp M1A-equivalent in NJ, it would say M-21 on the receiver, since that is not on their banned list.)
You could also check out
MNMR or M21 M14 semi-auto NM Receiver* (specify) $449.00
MNMRLR M14 semi-auto NM Rear Lugged Receiver* (Rear Bushing w/Bolt ADD $14.95) $599.00
MNMDLR M14 semi-auto NM Double Lugged Receiver* (Front and Rear Bushings w/Bolts ADD $25.95) $699.00
-Entreprise Atrms http://www.entreprise.com/Catalog.htm
CNC Machined from a 22 pound 8620 Billet to original military blueprints, Surface Rockwell of 52 - 56Rc, Core Rockwell 34 - 38 RC, Black Oxide, All hand gaged and fully inspected, Unconditional Lifetime Guarantee
K01 Solid Billet M14 Receiver (Hand guaged and inspected) Dealer $599.00 Retail $799.00
K0RL Solid Billet M14 Receiver w/ rear lug (Hand guaged and inspected) Dealer $799.00 Retail $999.00
K0FRL Solid Billet M14 Receiver w/front & rear lug (Hand guaged and inspected) Dealer $999.00 Retail $1199.00
Personally, I would use the Springfield standard receiver. The real difference comes from who builds and fits it, not who made that parts, as long as they are in spec.