I bought an ATN PS-14 Gen2+ from eBay for $700 a while back, it's more than adequate for scratching the itch, and it allows me to operate at night time. It's light years ahead of gen1. The price was very good, and I can always sell it to someone who wants to get into decent NV for cheap.
The major difference between mine and a $2k PVS-14 Gen3 is resolution, brightness control, auto-off, and field of view. For the price, it's something to look at.
A functional helmet will run you about $300... A decent laser for a rifle will cost about $500, and then pistol for another $500. When you add in IR Torches, from Amazon/eBay, you're still up to about $1500 in just things you need to make it work.
All this is just me saying "Buy the best you can afford, but don't think any of it is going to be cheap." I wish I had a good gen3 tube, but I can always upgrade later.
ETA: I tried the rifle mount j-arm for a while, but decided it wasn't the way to go. Limited field of view and lack of versatility made me wish I'd gone a different route.