For less than $1200, you can probably get a better FAL copy than you can an M14 copy. You can get a nice Para or even a Greek made SAR8 for that kind of money. Under $1200 you can get a Federal Ordnance M14A or an Armscorp import.
If you have more than $1200 to spend, go ahead and get the M14 copy. You can get a Springfield with a lifetime warranty.
The first .308 gun I had was an HK91-copy with a Greek receiver and all the rest of the parts were real German HK's. I priced it ridiculously high(I paid $600 for it) and someone actually bought it.
That's when I decided to get a SHTF rifle that would double as a range plinker.
For what I sold the HK-91 for, I bought a Federal Ordnance M14A and an Armalite AR-10 complete upper and complete lower.
The Fed Ord gun is an early production gun with the only non-MilSpec part being the Federal Ordnance receiver. Fulton used to have a page up describing two problems they believed to have endemic to the FedOrd guns, and I printed off that page and had my gun inspected by two different smiths who retired from the Armory at Fort McClelland, and they found neither of the faults that Fulton specified. Basically, for the same price as a MilSpec parts kit, I bought a firing rifle in excellent condition.
I started to buy another FAL copy, and was set on getting an STG Para. I tried out a couple and found out I didn't like having to tune the gas system to my ammo, and even worse, I found that guys who'd owned the guns several years still had difficult tuning the Para gas system. Oddly, this wasn't a problem with a beat-up FN, or one of those "icky"(at least to the purists) parts-kit guns built with Portugese and South African parts or even a Dan Coonan receiver gun.
I'm not attacking the Para's, it was just something I didn't want to deal with, and I'm describing how I ended up going with the AR-10. It put me off the PARA and I found it odd that it wasn't a problem with three really beatup or "low cost" FAL copies.
So I started looking for an AR in .308 platform. I tried a DPMS and I learned of some of the owner's problems with the receiver and overall I just wasn't impressed with the DPMS- especially as a $1000+ gun.
Next I hunted down a couple of Bushmaster BAR-10's and they all had some common quirks and issues. The FAL/L1A1 mags didn't seem to seat right and the guns had common problems with feeding. The bolt being less supported and one of lugs being deleted to get the FAL mags to work was also a bit of worry issue for me.
Now that RRA is producing the BAR-10 as the LAR-8 they said they have all that fixed, but a friend of mine owns BAR-10 and his brother bought a LAR-8 and when we stripped them they looked exactly the same, piece for piece inside the lower. Ironically, during teardown Tim discovered the BAR-10 had a problem developing with the way the bolt was traveling and he was able to get that fixed(for the time being).
So finally I found an AR-10B to try, and I really, really, really, really, really, really liked it.
I couldn't afford a "finished" AR-10 and I sure couldn't afford the 10B model, so I bought a pair of lowers, and a guy named Brent gave me the deal of a lifetime on a part of new, never used complete Armalite AR-10 uppers.
If I could get my money back out of the Federal Ordnance M14A, I'd build a third and fourth AR-10, that's how much I like them.
The AR-10 carbine keeps up with any M1A or M14 that comes out to the local firing range, and the one I have with the competition barrel can knock all but the very best($2500+) out of the water.
A lot of people still look down on the AR platform, but it has developed into a splendid performer and it's earned much if not all of the legend that it has built up.
I know that I originally wanted an M14/M1A because I looked down on the AR guns. Had I had enough sense to fire them all before I made the purchase decision, I would have three AR-10's, and wouldn't have bought the M14A. Still, the M14A is a classic, and it's a lot of fun to shoot. However, dollar for dollar the AR-10's are superior in my experience and perception.
So between the FAL and the M1A, buy the AR-10,
If an AR-10 isn't happening, go for the M1A.
Best of luck. The nice thing about the decision you're making is that you're sure to enjoy your purchase no matter which one you choose.