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While I agree with you on the HK91 (I have had one for about 7 years) the postban FALs are MUCH better made than the current crop of crappy postban G3 clones.
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So true, but that is why you get the REAL thing. All the clones ARE crap, unless you get someone good to build you an FMP receiver gun.
I have honestly not yet gotten into the FALs, but a nice postban (prebans are more expensive than HKs as I have seen!) is very high on my wish list.
So by default I choose the HK91, but as others have mentioned, it is pricey, and parts are expensive, and it is heavy, but what do you expect it's a MBR.
I wouldn't say that a HK91 is a safe queen by any means. I shoot the hell out of mine, and as far as reliability have never had a single problem that couldn't be attributed to my own stupidity. Accuracy is above par, and can be tweaked to the extreme if you are willing to throw down the dough (i.e. PSG1 conversion, etc.).
But I don't think you will go wrong by any of the 4 choices, it should come down to what you are comfortable with or what fits in your budget. On the HKs, if you can't afford the real thing, or a FMP, go with the other 3 options.