the PVS7s have their place, they are really good for viewing for
extended periods of time from a static position.
the small ocular lenses don't bother you when you're not moving,
the ability to use both eyes means less strain, more "perceived"
detail...
also, there are some affordable 3x / 5x / ... objective lenses on
the market for really nice medium-long distance spotting.
7s are THE best deal out there for static night time observation
while giving you the option to head mount as well, although that's
not where they shine.
HOWEVER
the PVS14 is, in fact, much more versatile with all its mounting
options, accesories and whatnot...especially for head-/helmet
mounting they can't be beat.
so, if you're getting only a single one device to do it all, including
lots of walking around w/ the device head mounted, maybe a weapon
mount... the 14 is definitely what you want, the 7 would be an excellent
2nd purchase to complement the 14 later on.
regarding ATN: too many variables here, if you're set on the PVS7 I
suggest ebay. there are dozens of PVS7s out there for araound 1500
bucks, it'll be the same crabshoot in regards to quality as if you buy
from ATN but you'll save 1k and are halfway there to buy the next NVD