If you can afford it, then go with the PVS-14 nvgs.
I spent 10 years active duty in the Infantry/Army and used PVS-5 (not very good even when new) and PVS-7 B & Ds (much better than 5s). Mainly they were used for movement and security since PAQ-4s were in short supply. Depth perseption and degraded night vision after removing the nvgs (mark 1 eyeball) were the main problems since both eyes were used while wearing the goggles.
I later joined my local Army Nat.Guard when I learned they were going to Iraq and was pleaseantly suprised when we were issued the newest weapons and equipment before deploying. The PVS-14 was part of the issue and I fell in love with it. Light weight, single eyepiece, and mulitiple mounting options (headharness, helmet, and rifle). I liked them so much that after I came home, I bought one from a dealer at the Tulsa gunshow.
I actually got a great deal, the dealer was from California and a customer had sent a $500 deposit with the balance to be paid when he picked it up at the show. The customer tried to weasel a lower price from the dealer at the show and lost his deposit as a restocking fee. The dealer ended up selling me the compleate setup-headharness, helmet mount, soft carring case with small accescories, and the brand new ITT PVS-14 for $3000. Heck he even threw in a pair of AA batteries.