Iefan - it will be interesting to see what replies you get as you ask some very technical questions that probably only the manufacturers have the answer to.
Probably any of the products on your list will be suitable and the only way of deciding which one is best would be to try them all and see for yourself.
It is important that you get your aircraft lighting (internal and external) set up properly - military would go for black light steerable spotlight and floods but a white light/NVG mix is very workable in non-tactical scenarios.
You might also want to consider the weight and the distribution of that weight when selecting your NVGs and helmet combination, as a well fitting helmet with good weight distribution will help prevent fatigue and sore necks amongst your pilots.
Ultimately your choice will be limited by the ITARs and what the DoD let you have but gen 3 are still very good goggles.
Not entirely convinced about the 60 deg FOV - probably special ops are the only people to get that sort of technology and it might just be a manufacturer's fudge by putting a different (wide angle and therefore distorting) objective lens on the front. Again, try before you buy.